| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <sys/mount.h> |
| |
| #include <linux/kdev_t.h> |
| |
| #define LOG_TAG "Vold" |
| |
| #include <openssl/md5.h> |
| |
| #include <cutils/log.h> |
| |
| #include <sysutils/NetlinkEvent.h> |
| |
| #include "VolumeManager.h" |
| #include "DirectVolume.h" |
| #include "ResponseCode.h" |
| #include "Loop.h" |
| #include "Fat.h" |
| #include "Devmapper.h" |
| #include "Process.h" |
| #include "Asec.h" |
| |
| VolumeManager *VolumeManager::sInstance = NULL; |
| |
| VolumeManager *VolumeManager::Instance() { |
| if (!sInstance) |
| sInstance = new VolumeManager(); |
| return sInstance; |
| } |
| |
| VolumeManager::VolumeManager() { |
| mDebug = false; |
| mVolumes = new VolumeCollection(); |
| mActiveContainers = new AsecIdCollection(); |
| mBroadcaster = NULL; |
| mUsbMassStorageEnabled = false; |
| mUsbConnected = false; |
| mUmsSharingCount = 0; |
| mSavedDirtyRatio = -1; |
| // set dirty ratio to 0 when UMS is active |
| mUmsDirtyRatio = 0; |
| |
| readInitialState(); |
| } |
| |
| void VolumeManager::readInitialState() { |
| FILE *fp; |
| char state[255]; |
| |
| /* |
| * Read the initial mass storage enabled state |
| */ |
| if ((fp = fopen("/sys/devices/virtual/usb_composite/usb_mass_storage/enable", "r"))) { |
| if (fgets(state, sizeof(state), fp)) { |
| mUsbMassStorageEnabled = !strncmp(state, "1", 1); |
| } else { |
| SLOGE("Failed to read usb_mass_storage enabled state (%s)", strerror(errno)); |
| } |
| fclose(fp); |
| } else { |
| SLOGD("USB mass storage support is not enabled in the kernel"); |
| } |
| |
| /* |
| * Read the initial USB connected state |
| */ |
| if ((fp = fopen("/sys/devices/virtual/switch/usb_configuration/state", "r"))) { |
| if (fgets(state, sizeof(state), fp)) { |
| mUsbConnected = !strncmp(state, "1", 1); |
| } else { |
| SLOGE("Failed to read usb_configuration switch (%s)", strerror(errno)); |
| } |
| fclose(fp); |
| } else { |
| SLOGD("usb_configuration switch is not enabled in the kernel"); |
| } |
| } |
| |
| VolumeManager::~VolumeManager() { |
| delete mVolumes; |
| delete mActiveContainers; |
| } |
| |
| char *VolumeManager::asecHash(const char *id, char *buffer, size_t len) { |
| static const char* digits = "0123456789abcdef"; |
| |
| unsigned char sig[MD5_DIGEST_LENGTH]; |
| |
| if (buffer == NULL) { |
| SLOGE("Destination buffer is NULL"); |
| errno = ESPIPE; |
| return NULL; |
| } else if (id == NULL) { |
| SLOGE("Source buffer is NULL"); |
| errno = ESPIPE; |
| return NULL; |
| } else if (len < MD5_ASCII_LENGTH_PLUS_NULL) { |
| SLOGE("Target hash buffer size < %d bytes (%d)", |
| MD5_ASCII_LENGTH_PLUS_NULL, len); |
| errno = ESPIPE; |
| return NULL; |
| } |
| |
| MD5(reinterpret_cast<const unsigned char*>(id), strlen(id), sig); |
| |
| char *p = buffer; |
| for (int i = 0; i < MD5_DIGEST_LENGTH; i++) { |
| *p++ = digits[sig[i] >> 4]; |
| *p++ = digits[sig[i] & 0x0F]; |
| } |
| *p = '\0'; |
| |
| return buffer; |
| } |
| |
| void VolumeManager::setDebug(bool enable) { |
| mDebug = enable; |
| VolumeCollection::iterator it; |
| for (it = mVolumes->begin(); it != mVolumes->end(); ++it) { |
| (*it)->setDebug(enable); |
| } |
| } |
| |
| int VolumeManager::start() { |
| return 0; |
| } |
| |
| int VolumeManager::stop() { |
| return 0; |
| } |
| |
| int VolumeManager::addVolume(Volume *v) { |
| mVolumes->push_back(v); |
| return 0; |
| } |
| |
| void VolumeManager::notifyUmsAvailable(bool available) { |
| char msg[255]; |
| |
| snprintf(msg, sizeof(msg), "Share method ums now %s", |
| (available ? "available" : "unavailable")); |
| SLOGD(msg); |
| getBroadcaster()->sendBroadcast(ResponseCode::ShareAvailabilityChange, |
| msg, false); |
| } |
| |
| void VolumeManager::handleSwitchEvent(NetlinkEvent *evt) { |
| const char *devpath = evt->findParam("DEVPATH"); |
| const char *name = evt->findParam("SWITCH_NAME"); |
| const char *state = evt->findParam("SWITCH_STATE"); |
| |
| if (!name || !state) { |
| SLOGW("Switch %s event missing name/state info", devpath); |
| return; |
| } |
| |
| bool oldAvailable = massStorageAvailable(); |
| if (!strcmp(name, "usb_configuration")) { |
| mUsbConnected = !strcmp(state, "1"); |
| SLOGD("USB %s", mUsbConnected ? "connected" : "disconnected"); |
| bool newAvailable = massStorageAvailable(); |
| if (newAvailable != oldAvailable) { |
| notifyUmsAvailable(newAvailable); |
| } |
| } else { |
| SLOGW("Ignoring unknown switch '%s'", name); |
| } |
| } |
| void VolumeManager::handleUsbCompositeEvent(NetlinkEvent *evt) { |
| const char *function = evt->findParam("FUNCTION"); |
| const char *enabled = evt->findParam("ENABLED"); |
| |
| if (!function || !enabled) { |
| SLOGW("usb_composite event missing function/enabled info"); |
| return; |
| } |
| |
| if (!strcmp(function, "usb_mass_storage")) { |
| bool oldAvailable = massStorageAvailable(); |
| mUsbMassStorageEnabled = !strcmp(enabled, "1"); |
| SLOGD("usb_mass_storage function %s", mUsbMassStorageEnabled ? "enabled" : "disabled"); |
| bool newAvailable = massStorageAvailable(); |
| if (newAvailable != oldAvailable) { |
| notifyUmsAvailable(newAvailable); |
| } |
| } |
| } |
| |
| void VolumeManager::handleBlockEvent(NetlinkEvent *evt) { |
| const char *devpath = evt->findParam("DEVPATH"); |
| |
| /* Lookup a volume to handle this device */ |
| VolumeCollection::iterator it; |
| bool hit = false; |
| for (it = mVolumes->begin(); it != mVolumes->end(); ++it) { |
| if (!(*it)->handleBlockEvent(evt)) { |
| #ifdef NETLINK_DEBUG |
| SLOGD("Device '%s' event handled by volume %s\n", devpath, (*it)->getLabel()); |
| #endif |
| hit = true; |
| break; |
| } |
| } |
| |
| if (!hit) { |
| #ifdef NETLINK_DEBUG |
| SLOGW("No volumes handled block event for '%s'", devpath); |
| #endif |
| } |
| } |
| |
| int VolumeManager::listVolumes(SocketClient *cli) { |
| VolumeCollection::iterator i; |
| |
| for (i = mVolumes->begin(); i != mVolumes->end(); ++i) { |
| char *buffer; |
| asprintf(&buffer, "%s %s %d", |
| (*i)->getLabel(), (*i)->getMountpoint(), |
| (*i)->getState()); |
| cli->sendMsg(ResponseCode::VolumeListResult, buffer, false); |
| free(buffer); |
| } |
| cli->sendMsg(ResponseCode::CommandOkay, "Volumes listed.", false); |
| return 0; |
| } |
| |
| int VolumeManager::formatVolume(const char *label) { |
| Volume *v = lookupVolume(label); |
| |
| if (!v) { |
| errno = ENOENT; |
| return -1; |
| } |
| |
| return v->formatVol(); |
| } |
| |
| int VolumeManager::getObbMountPath(const char *sourceFile, char *mountPath, int mountPathLen) { |
| char idHash[33]; |
| if (!asecHash(sourceFile, idHash, sizeof(idHash))) { |
| SLOGE("Hash of '%s' failed (%s)", sourceFile, strerror(errno)); |
| return -1; |
| } |
| |
| memset(mountPath, 0, mountPathLen); |
| snprintf(mountPath, mountPathLen, "%s/%s", Volume::LOOPDIR, idHash); |
| |
| if (access(mountPath, F_OK)) { |
| errno = ENOENT; |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| int VolumeManager::getAsecMountPath(const char *id, char *buffer, int maxlen) { |
| char asecFileName[255]; |
| snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); |
| |
| memset(buffer, 0, maxlen); |
| if (access(asecFileName, F_OK)) { |
| errno = ENOENT; |
| return -1; |
| } |
| |
| snprintf(buffer, maxlen, "%s/%s", Volume::ASECDIR, id); |
| return 0; |
| } |
| |
| int VolumeManager::createAsec(const char *id, unsigned int numSectors, |
| const char *fstype, const char *key, int ownerUid) { |
| struct asec_superblock sb; |
| memset(&sb, 0, sizeof(sb)); |
| |
| sb.magic = ASEC_SB_MAGIC; |
| sb.ver = ASEC_SB_VER; |
| |
| if (numSectors < ((1024*1024)/512)) { |
| SLOGE("Invalid container size specified (%d sectors)", numSectors); |
| errno = EINVAL; |
| return -1; |
| } |
| |
| if (lookupVolume(id)) { |
| SLOGE("ASEC id '%s' currently exists", id); |
| errno = EADDRINUSE; |
| return -1; |
| } |
| |
| char asecFileName[255]; |
| snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); |
| |
| if (!access(asecFileName, F_OK)) { |
| SLOGE("ASEC file '%s' currently exists - destroy it first! (%s)", |
| asecFileName, strerror(errno)); |
| errno = EADDRINUSE; |
| return -1; |
| } |
| |
| /* |
| * Add some headroom |
| */ |
| unsigned fatSize = (((numSectors * 4) / 512) + 1) * 2; |
| unsigned numImgSectors = numSectors + fatSize + 2; |
| |
| if (numImgSectors % 63) { |
| numImgSectors += (63 - (numImgSectors % 63)); |
| } |
| |
| // Add +1 for our superblock which is at the end |
| if (Loop::createImageFile(asecFileName, numImgSectors + 1)) { |
| SLOGE("ASEC image file creation failed (%s)", strerror(errno)); |
| return -1; |
| } |
| |
| char idHash[33]; |
| if (!asecHash(id, idHash, sizeof(idHash))) { |
| SLOGE("Hash of '%s' failed (%s)", id, strerror(errno)); |
| unlink(asecFileName); |
| return -1; |
| } |
| |
| char loopDevice[255]; |
| if (Loop::create(idHash, asecFileName, loopDevice, sizeof(loopDevice))) { |
| SLOGE("ASEC loop device creation failed (%s)", strerror(errno)); |
| unlink(asecFileName); |
| return -1; |
| } |
| |
| char dmDevice[255]; |
| bool cleanupDm = false; |
| |
| if (strcmp(key, "none")) { |
| // XXX: This is all we support for now |
| sb.c_cipher = ASEC_SB_C_CIPHER_TWOFISH; |
| if (Devmapper::create(idHash, loopDevice, key, numImgSectors, dmDevice, |
| sizeof(dmDevice))) { |
| SLOGE("ASEC device mapping failed (%s)", strerror(errno)); |
| Loop::destroyByDevice(loopDevice); |
| unlink(asecFileName); |
| return -1; |
| } |
| cleanupDm = true; |
| } else { |
| sb.c_cipher = ASEC_SB_C_CIPHER_NONE; |
| strcpy(dmDevice, loopDevice); |
| } |
| |
| /* |
| * Drop down the superblock at the end of the file |
| */ |
| |
| int sbfd = open(loopDevice, O_RDWR); |
| if (sbfd < 0) { |
| SLOGE("Failed to open new DM device for superblock write (%s)", strerror(errno)); |
| if (cleanupDm) { |
| Devmapper::destroy(idHash); |
| } |
| Loop::destroyByDevice(loopDevice); |
| unlink(asecFileName); |
| return -1; |
| } |
| |
| if (lseek(sbfd, (numImgSectors * 512), SEEK_SET) < 0) { |
| close(sbfd); |
| SLOGE("Failed to lseek for superblock (%s)", strerror(errno)); |
| if (cleanupDm) { |
| Devmapper::destroy(idHash); |
| } |
| Loop::destroyByDevice(loopDevice); |
| unlink(asecFileName); |
| return -1; |
| } |
| |
| if (write(sbfd, &sb, sizeof(sb)) != sizeof(sb)) { |
| close(sbfd); |
| SLOGE("Failed to write superblock (%s)", strerror(errno)); |
| if (cleanupDm) { |
| Devmapper::destroy(idHash); |
| } |
| Loop::destroyByDevice(loopDevice); |
| unlink(asecFileName); |
| return -1; |
| } |
| close(sbfd); |
| |
| if (strcmp(fstype, "none")) { |
| if (strcmp(fstype, "fat")) { |
| SLOGW("Unknown fstype '%s' specified for container", fstype); |
| } |
| |
| if (Fat::format(dmDevice, numImgSectors)) { |
| SLOGE("ASEC FAT format failed (%s)", strerror(errno)); |
| if (cleanupDm) { |
| Devmapper::destroy(idHash); |
| } |
| Loop::destroyByDevice(loopDevice); |
| unlink(asecFileName); |
| return -1; |
| } |
| char mountPoint[255]; |
| |
| snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); |
| if (mkdir(mountPoint, 0777)) { |
| if (errno != EEXIST) { |
| SLOGE("Mountpoint creation failed (%s)", strerror(errno)); |
| if (cleanupDm) { |
| Devmapper::destroy(idHash); |
| } |
| Loop::destroyByDevice(loopDevice); |
| unlink(asecFileName); |
| return -1; |
| } |
| } |
| |
| if (Fat::doMount(dmDevice, mountPoint, false, false, false, ownerUid, |
| 0, 0000, false)) { |
| SLOGE("ASEC FAT mount failed (%s)", strerror(errno)); |
| if (cleanupDm) { |
| Devmapper::destroy(idHash); |
| } |
| Loop::destroyByDevice(loopDevice); |
| unlink(asecFileName); |
| return -1; |
| } |
| } else { |
| SLOGI("Created raw secure container %s (no filesystem)", id); |
| } |
| |
| mActiveContainers->push_back(new ContainerData(strdup(id), ASEC)); |
| return 0; |
| } |
| |
| int VolumeManager::finalizeAsec(const char *id) { |
| char asecFileName[255]; |
| char loopDevice[255]; |
| char mountPoint[255]; |
| |
| snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); |
| |
| char idHash[33]; |
| if (!asecHash(id, idHash, sizeof(idHash))) { |
| SLOGE("Hash of '%s' failed (%s)", id, strerror(errno)); |
| return -1; |
| } |
| |
| if (Loop::lookupActive(idHash, loopDevice, sizeof(loopDevice))) { |
| SLOGE("Unable to finalize %s (%s)", id, strerror(errno)); |
| return -1; |
| } |
| |
| snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); |
| // XXX: |
| if (Fat::doMount(loopDevice, mountPoint, true, true, true, 0, 0, 0227, false)) { |
| SLOGE("ASEC finalize mount failed (%s)", strerror(errno)); |
| return -1; |
| } |
| |
| if (mDebug) { |
| SLOGD("ASEC %s finalized", id); |
| } |
| return 0; |
| } |
| |
| int VolumeManager::renameAsec(const char *id1, const char *id2) { |
| char *asecFilename1; |
| char *asecFilename2; |
| char mountPoint[255]; |
| |
| asprintf(&asecFilename1, "%s/%s.asec", Volume::SEC_ASECDIR, id1); |
| asprintf(&asecFilename2, "%s/%s.asec", Volume::SEC_ASECDIR, id2); |
| |
| snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id1); |
| if (isMountpointMounted(mountPoint)) { |
| SLOGW("Rename attempt when src mounted"); |
| errno = EBUSY; |
| goto out_err; |
| } |
| |
| snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id2); |
| if (isMountpointMounted(mountPoint)) { |
| SLOGW("Rename attempt when dst mounted"); |
| errno = EBUSY; |
| goto out_err; |
| } |
| |
| if (!access(asecFilename2, F_OK)) { |
| SLOGE("Rename attempt when dst exists"); |
| errno = EADDRINUSE; |
| goto out_err; |
| } |
| |
| if (rename(asecFilename1, asecFilename2)) { |
| SLOGE("Rename of '%s' to '%s' failed (%s)", asecFilename1, asecFilename2, strerror(errno)); |
| goto out_err; |
| } |
| |
| free(asecFilename1); |
| free(asecFilename2); |
| return 0; |
| |
| out_err: |
| free(asecFilename1); |
| free(asecFilename2); |
| return -1; |
| } |
| |
| #define UNMOUNT_RETRIES 5 |
| #define UNMOUNT_SLEEP_BETWEEN_RETRY_MS (1000 * 1000) |
| int VolumeManager::unmountAsec(const char *id, bool force) { |
| char asecFileName[255]; |
| char mountPoint[255]; |
| |
| snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); |
| snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); |
| |
| char idHash[33]; |
| if (!asecHash(id, idHash, sizeof(idHash))) { |
| SLOGE("Hash of '%s' failed (%s)", id, strerror(errno)); |
| return -1; |
| } |
| |
| return unmountLoopImage(id, idHash, asecFileName, mountPoint, force); |
| } |
| |
| int VolumeManager::unmountObb(const char *fileName, bool force) { |
| char mountPoint[255]; |
| |
| char idHash[33]; |
| if (!asecHash(fileName, idHash, sizeof(idHash))) { |
| SLOGE("Hash of '%s' failed (%s)", fileName, strerror(errno)); |
| return -1; |
| } |
| |
| snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::LOOPDIR, idHash); |
| |
| return unmountLoopImage(fileName, idHash, fileName, mountPoint, force); |
| } |
| |
| int VolumeManager::unmountLoopImage(const char *id, const char *idHash, |
| const char *fileName, const char *mountPoint, bool force) { |
| if (!isMountpointMounted(mountPoint)) { |
| SLOGE("Unmount request for %s when not mounted", id); |
| errno = ENOENT; |
| return -1; |
| } |
| |
| int i, rc; |
| for (i = 1; i <= UNMOUNT_RETRIES; i++) { |
| rc = umount(mountPoint); |
| if (!rc) { |
| break; |
| } |
| if (rc && (errno == EINVAL || errno == ENOENT)) { |
| SLOGI("Container %s unmounted OK", id); |
| rc = 0; |
| break; |
| } |
| SLOGW("%s unmount attempt %d failed (%s)", |
| id, i, strerror(errno)); |
| |
| int action = 0; // default is to just complain |
| |
| if (force) { |
| if (i > (UNMOUNT_RETRIES - 2)) |
| action = 2; // SIGKILL |
| else if (i > (UNMOUNT_RETRIES - 3)) |
| action = 1; // SIGHUP |
| } |
| |
| Process::killProcessesWithOpenFiles(mountPoint, action); |
| usleep(UNMOUNT_SLEEP_BETWEEN_RETRY_MS); |
| } |
| |
| if (rc) { |
| errno = EBUSY; |
| SLOGE("Failed to unmount container %s (%s)", id, strerror(errno)); |
| return -1; |
| } |
| |
| int retries = 10; |
| |
| while(retries--) { |
| if (!rmdir(mountPoint)) { |
| break; |
| } |
| |
| SLOGW("Failed to rmdir %s (%s)", mountPoint, strerror(errno)); |
| usleep(UNMOUNT_SLEEP_BETWEEN_RETRY_MS); |
| } |
| |
| if (!retries) { |
| SLOGE("Timed out trying to rmdir %s (%s)", mountPoint, strerror(errno)); |
| } |
| |
| if (Devmapper::destroy(idHash) && errno != ENXIO) { |
| SLOGE("Failed to destroy devmapper instance (%s)", strerror(errno)); |
| } |
| |
| char loopDevice[255]; |
| if (!Loop::lookupActive(idHash, loopDevice, sizeof(loopDevice))) { |
| Loop::destroyByDevice(loopDevice); |
| } else { |
| SLOGW("Failed to find loop device for {%s} (%s)", fileName, strerror(errno)); |
| } |
| |
| AsecIdCollection::iterator it; |
| for (it = mActiveContainers->begin(); it != mActiveContainers->end(); ++it) { |
| ContainerData* cd = *it; |
| if (!strcmp(cd->id, id)) { |
| free(*it); |
| mActiveContainers->erase(it); |
| break; |
| } |
| } |
| if (it == mActiveContainers->end()) { |
| SLOGW("mActiveContainers is inconsistent!"); |
| } |
| return 0; |
| } |
| |
| int VolumeManager::destroyAsec(const char *id, bool force) { |
| char asecFileName[255]; |
| char mountPoint[255]; |
| |
| snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); |
| snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); |
| |
| if (isMountpointMounted(mountPoint)) { |
| if (mDebug) { |
| SLOGD("Unmounting container before destroy"); |
| } |
| if (unmountAsec(id, force)) { |
| SLOGE("Failed to unmount asec %s for destroy (%s)", id, strerror(errno)); |
| return -1; |
| } |
| } |
| |
| if (unlink(asecFileName)) { |
| SLOGE("Failed to unlink asec '%s' (%s)", asecFileName, strerror(errno)); |
| return -1; |
| } |
| |
| if (mDebug) { |
| SLOGD("ASEC %s destroyed", id); |
| } |
| return 0; |
| } |
| |
| int VolumeManager::mountAsec(const char *id, const char *key, int ownerUid) { |
| char asecFileName[255]; |
| char mountPoint[255]; |
| |
| snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); |
| snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); |
| |
| if (isMountpointMounted(mountPoint)) { |
| SLOGE("ASEC %s already mounted", id); |
| errno = EBUSY; |
| return -1; |
| } |
| |
| char idHash[33]; |
| if (!asecHash(id, idHash, sizeof(idHash))) { |
| SLOGE("Hash of '%s' failed (%s)", id, strerror(errno)); |
| return -1; |
| } |
| |
| char loopDevice[255]; |
| if (Loop::lookupActive(idHash, loopDevice, sizeof(loopDevice))) { |
| if (Loop::create(idHash, asecFileName, loopDevice, sizeof(loopDevice))) { |
| SLOGE("ASEC loop device creation failed (%s)", strerror(errno)); |
| return -1; |
| } |
| if (mDebug) { |
| SLOGD("New loop device created at %s", loopDevice); |
| } |
| } else { |
| if (mDebug) { |
| SLOGD("Found active loopback for %s at %s", asecFileName, loopDevice); |
| } |
| } |
| |
| char dmDevice[255]; |
| bool cleanupDm = false; |
| int fd; |
| unsigned int nr_sec = 0; |
| |
| if ((fd = open(loopDevice, O_RDWR)) < 0) { |
| SLOGE("Failed to open loopdevice (%s)", strerror(errno)); |
| Loop::destroyByDevice(loopDevice); |
| return -1; |
| } |
| |
| if (ioctl(fd, BLKGETSIZE, &nr_sec)) { |
| SLOGE("Failed to get loop size (%s)", strerror(errno)); |
| Loop::destroyByDevice(loopDevice); |
| close(fd); |
| return -1; |
| } |
| |
| /* |
| * Validate superblock |
| */ |
| struct asec_superblock sb; |
| memset(&sb, 0, sizeof(sb)); |
| if (lseek(fd, ((nr_sec-1) * 512), SEEK_SET) < 0) { |
| SLOGE("lseek failed (%s)", strerror(errno)); |
| close(fd); |
| Loop::destroyByDevice(loopDevice); |
| return -1; |
| } |
| if (read(fd, &sb, sizeof(sb)) != sizeof(sb)) { |
| SLOGE("superblock read failed (%s)", strerror(errno)); |
| close(fd); |
| Loop::destroyByDevice(loopDevice); |
| return -1; |
| } |
| |
| close(fd); |
| |
| if (mDebug) { |
| SLOGD("Container sb magic/ver (%.8x/%.2x)", sb.magic, sb.ver); |
| } |
| if (sb.magic != ASEC_SB_MAGIC || sb.ver != ASEC_SB_VER) { |
| SLOGE("Bad container magic/version (%.8x/%.2x)", sb.magic, sb.ver); |
| Loop::destroyByDevice(loopDevice); |
| errno = EMEDIUMTYPE; |
| return -1; |
| } |
| nr_sec--; // We don't want the devmapping to extend onto our superblock |
| |
| if (strcmp(key, "none")) { |
| if (Devmapper::lookupActive(idHash, dmDevice, sizeof(dmDevice))) { |
| if (Devmapper::create(idHash, loopDevice, key, nr_sec, |
| dmDevice, sizeof(dmDevice))) { |
| SLOGE("ASEC device mapping failed (%s)", strerror(errno)); |
| Loop::destroyByDevice(loopDevice); |
| return -1; |
| } |
| if (mDebug) { |
| SLOGD("New devmapper instance created at %s", dmDevice); |
| } |
| } else { |
| if (mDebug) { |
| SLOGD("Found active devmapper for %s at %s", asecFileName, dmDevice); |
| } |
| } |
| cleanupDm = true; |
| } else { |
| strcpy(dmDevice, loopDevice); |
| } |
| |
| if (mkdir(mountPoint, 0777)) { |
| if (errno != EEXIST) { |
| SLOGE("Mountpoint creation failed (%s)", strerror(errno)); |
| if (cleanupDm) { |
| Devmapper::destroy(idHash); |
| } |
| Loop::destroyByDevice(loopDevice); |
| return -1; |
| } |
| } |
| |
| if (Fat::doMount(dmDevice, mountPoint, true, false, true, ownerUid, 0, |
| 0222, false)) { |
| // 0227, false)) { |
| SLOGE("ASEC mount failed (%s)", strerror(errno)); |
| if (cleanupDm) { |
| Devmapper::destroy(idHash); |
| } |
| Loop::destroyByDevice(loopDevice); |
| return -1; |
| } |
| |
| mActiveContainers->push_back(new ContainerData(strdup(id), ASEC)); |
| if (mDebug) { |
| SLOGD("ASEC %s mounted", id); |
| } |
| return 0; |
| } |
| |
| /** |
| * Mounts an image file <code>img</code>. |
| */ |
| int VolumeManager::mountObb(const char *img, const char *key, int ownerUid) { |
| char mountPoint[255]; |
| |
| char idHash[33]; |
| if (!asecHash(img, idHash, sizeof(idHash))) { |
| SLOGE("Hash of '%s' failed (%s)", img, strerror(errno)); |
| return -1; |
| } |
| |
| snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::LOOPDIR, idHash); |
| |
| if (isMountpointMounted(mountPoint)) { |
| SLOGE("Image %s already mounted", img); |
| errno = EBUSY; |
| return -1; |
| } |
| |
| char loopDevice[255]; |
| if (Loop::lookupActive(idHash, loopDevice, sizeof(loopDevice))) { |
| if (Loop::create(idHash, img, loopDevice, sizeof(loopDevice))) { |
| SLOGE("Image loop device creation failed (%s)", strerror(errno)); |
| return -1; |
| } |
| if (mDebug) { |
| SLOGD("New loop device created at %s", loopDevice); |
| } |
| } else { |
| if (mDebug) { |
| SLOGD("Found active loopback for %s at %s", img, loopDevice); |
| } |
| } |
| |
| char dmDevice[255]; |
| bool cleanupDm = false; |
| int fd; |
| unsigned int nr_sec = 0; |
| |
| if ((fd = open(loopDevice, O_RDWR)) < 0) { |
| SLOGE("Failed to open loopdevice (%s)", strerror(errno)); |
| Loop::destroyByDevice(loopDevice); |
| return -1; |
| } |
| |
| if (ioctl(fd, BLKGETSIZE, &nr_sec)) { |
| SLOGE("Failed to get loop size (%s)", strerror(errno)); |
| Loop::destroyByDevice(loopDevice); |
| close(fd); |
| return -1; |
| } |
| |
| close(fd); |
| |
| if (strcmp(key, "none")) { |
| if (Devmapper::lookupActive(idHash, dmDevice, sizeof(dmDevice))) { |
| if (Devmapper::create(idHash, loopDevice, key, nr_sec, |
| dmDevice, sizeof(dmDevice))) { |
| SLOGE("ASEC device mapping failed (%s)", strerror(errno)); |
| Loop::destroyByDevice(loopDevice); |
| return -1; |
| } |
| if (mDebug) { |
| SLOGD("New devmapper instance created at %s", dmDevice); |
| } |
| } else { |
| if (mDebug) { |
| SLOGD("Found active devmapper for %s at %s", img, dmDevice); |
| } |
| } |
| cleanupDm = true; |
| } else { |
| strcpy(dmDevice, loopDevice); |
| } |
| |
| if (mkdir(mountPoint, 0755)) { |
| if (errno != EEXIST) { |
| SLOGE("Mountpoint creation failed (%s)", strerror(errno)); |
| if (cleanupDm) { |
| Devmapper::destroy(idHash); |
| } |
| Loop::destroyByDevice(loopDevice); |
| return -1; |
| } |
| } |
| |
| if (Fat::doMount(dmDevice, mountPoint, true, false, true, ownerUid, 0, |
| 0227, false)) { |
| SLOGE("Image mount failed (%s)", strerror(errno)); |
| if (cleanupDm) { |
| Devmapper::destroy(idHash); |
| } |
| Loop::destroyByDevice(loopDevice); |
| return -1; |
| } |
| |
| mActiveContainers->push_back(new ContainerData(strdup(img), OBB)); |
| if (mDebug) { |
| SLOGD("Image %s mounted", img); |
| } |
| return 0; |
| } |
| |
| int VolumeManager::mountVolume(const char *label) { |
| Volume *v = lookupVolume(label); |
| |
| if (!v) { |
| errno = ENOENT; |
| return -1; |
| } |
| |
| return v->mountVol(); |
| } |
| |
| int VolumeManager::listMountedObbs(SocketClient* cli) { |
| char device[256]; |
| char mount_path[256]; |
| char rest[256]; |
| FILE *fp; |
| char line[1024]; |
| |
| if (!(fp = fopen("/proc/mounts", "r"))) { |
| SLOGE("Error opening /proc/mounts (%s)", strerror(errno)); |
| return -1; |
| } |
| |
| // Create a string to compare against that has a trailing slash |
| int loopDirLen = sizeof(Volume::LOOPDIR); |
| char loopDir[loopDirLen + 2]; |
| strcpy(loopDir, Volume::LOOPDIR); |
| loopDir[loopDirLen++] = '/'; |
| loopDir[loopDirLen] = '\0'; |
| |
| while(fgets(line, sizeof(line), fp)) { |
| line[strlen(line)-1] = '\0'; |
| |
| /* |
| * Should look like: |
| * /dev/block/loop0 /mnt/obb/fc99df1323fd36424f864dcb76b76d65 ... |
| */ |
| sscanf(line, "%255s %255s %255s\n", device, mount_path, rest); |
| |
| if (!strncmp(mount_path, loopDir, loopDirLen)) { |
| int fd = open(device, O_RDONLY); |
| if (fd >= 0) { |
| struct loop_info64 li; |
| if (ioctl(fd, LOOP_GET_STATUS64, &li) >= 0) { |
| cli->sendMsg(ResponseCode::AsecListResult, |
| (const char*) li.lo_file_name, false); |
| } |
| close(fd); |
| } |
| } |
| } |
| |
| fclose(fp); |
| return 0; |
| } |
| |
| int VolumeManager::shareAvailable(const char *method, bool *avail) { |
| |
| if (strcmp(method, "ums")) { |
| errno = ENOSYS; |
| return -1; |
| } |
| |
| *avail = massStorageAvailable(); |
| return 0; |
| } |
| |
| int VolumeManager::shareEnabled(const char *label, const char *method, bool *enabled) { |
| Volume *v = lookupVolume(label); |
| |
| if (!v) { |
| errno = ENOENT; |
| return -1; |
| } |
| |
| if (strcmp(method, "ums")) { |
| errno = ENOSYS; |
| return -1; |
| } |
| |
| if (v->getState() != Volume::State_Shared) { |
| *enabled = false; |
| } else { |
| *enabled = true; |
| } |
| return 0; |
| } |
| |
| int VolumeManager::simulate(const char *cmd, const char *arg) { |
| |
| if (!strcmp(cmd, "ums")) { |
| if (!strcmp(arg, "connect")) { |
| notifyUmsAvailable(true); |
| } else if (!strcmp(arg, "disconnect")) { |
| notifyUmsAvailable(false); |
| } else { |
| errno = EINVAL; |
| return -1; |
| } |
| } else { |
| errno = EINVAL; |
| return -1; |
| } |
| return 0; |
| } |
| |
| int VolumeManager::shareVolume(const char *label, const char *method) { |
| Volume *v = lookupVolume(label); |
| |
| if (!v) { |
| errno = ENOENT; |
| return -1; |
| } |
| |
| /* |
| * Eventually, we'll want to support additional share back-ends, |
| * some of which may work while the media is mounted. For now, |
| * we just support UMS |
| */ |
| if (strcmp(method, "ums")) { |
| errno = ENOSYS; |
| return -1; |
| } |
| |
| if (v->getState() == Volume::State_NoMedia) { |
| errno = ENODEV; |
| return -1; |
| } |
| |
| if (v->getState() != Volume::State_Idle) { |
| // You need to unmount manually befoe sharing |
| errno = EBUSY; |
| return -1; |
| } |
| |
| dev_t d = v->getShareDevice(); |
| if ((MAJOR(d) == 0) && (MINOR(d) == 0)) { |
| // This volume does not support raw disk access |
| errno = EINVAL; |
| return -1; |
| } |
| |
| int fd; |
| char nodepath[255]; |
| snprintf(nodepath, |
| sizeof(nodepath), "/dev/block/vold/%d:%d", |
| MAJOR(d), MINOR(d)); |
| |
| if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file", |
| O_WRONLY)) < 0) { |
| SLOGE("Unable to open ums lunfile (%s)", strerror(errno)); |
| return -1; |
| } |
| |
| if (write(fd, nodepath, strlen(nodepath)) < 0) { |
| SLOGE("Unable to write to ums lunfile (%s)", strerror(errno)); |
| close(fd); |
| return -1; |
| } |
| |
| close(fd); |
| v->handleVolumeShared(); |
| if (mUmsSharingCount++ == 0) { |
| FILE* fp; |
| mSavedDirtyRatio = -1; // in case we fail |
| if ((fp = fopen("/proc/sys/vm/dirty_ratio", "r+"))) { |
| char line[16]; |
| if (fgets(line, sizeof(line), fp) && sscanf(line, "%d", &mSavedDirtyRatio)) { |
| fprintf(fp, "%d\n", mUmsDirtyRatio); |
| } else { |
| SLOGE("Failed to read dirty_ratio (%s)", strerror(errno)); |
| } |
| fclose(fp); |
| } else { |
| SLOGE("Failed to open /proc/sys/vm/dirty_ratio (%s)", strerror(errno)); |
| } |
| } |
| return 0; |
| } |
| |
| int VolumeManager::unshareVolume(const char *label, const char *method) { |
| Volume *v = lookupVolume(label); |
| |
| if (!v) { |
| errno = ENOENT; |
| return -1; |
| } |
| |
| if (strcmp(method, "ums")) { |
| errno = ENOSYS; |
| return -1; |
| } |
| |
| if (v->getState() != Volume::State_Shared) { |
| errno = EINVAL; |
| return -1; |
| } |
| |
| int fd; |
| if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file", O_WRONLY)) < 0) { |
| SLOGE("Unable to open ums lunfile (%s)", strerror(errno)); |
| return -1; |
| } |
| |
| char ch = 0; |
| if (write(fd, &ch, 1) < 0) { |
| SLOGE("Unable to write to ums lunfile (%s)", strerror(errno)); |
| close(fd); |
| return -1; |
| } |
| |
| close(fd); |
| v->handleVolumeUnshared(); |
| if (--mUmsSharingCount == 0 && mSavedDirtyRatio != -1) { |
| FILE* fp; |
| if ((fp = fopen("/proc/sys/vm/dirty_ratio", "r+"))) { |
| fprintf(fp, "%d\n", mSavedDirtyRatio); |
| fclose(fp); |
| } else { |
| SLOGE("Failed to open /proc/sys/vm/dirty_ratio (%s)", strerror(errno)); |
| } |
| mSavedDirtyRatio = -1; |
| } |
| return 0; |
| } |
| |
| int VolumeManager::unmountVolume(const char *label, bool force) { |
| Volume *v = lookupVolume(label); |
| |
| if (!v) { |
| errno = ENOENT; |
| return -1; |
| } |
| |
| if (v->getState() == Volume::State_NoMedia) { |
| errno = ENODEV; |
| return -1; |
| } |
| |
| if (v->getState() != Volume::State_Mounted) { |
| SLOGW("Attempt to unmount volume which isn't mounted (%d)\n", |
| v->getState()); |
| errno = EBUSY; |
| return -1; |
| } |
| |
| cleanupAsec(v, force); |
| |
| return v->unmountVol(force); |
| } |
| |
| /* |
| * Looks up a volume by it's label or mount-point |
| */ |
| Volume *VolumeManager::lookupVolume(const char *label) { |
| VolumeCollection::iterator i; |
| |
| for (i = mVolumes->begin(); i != mVolumes->end(); ++i) { |
| if (label[0] == '/') { |
| if (!strcmp(label, (*i)->getMountpoint())) |
| return (*i); |
| } else { |
| if (!strcmp(label, (*i)->getLabel())) |
| return (*i); |
| } |
| } |
| return NULL; |
| } |
| |
| bool VolumeManager::isMountpointMounted(const char *mp) |
| { |
| char device[256]; |
| char mount_path[256]; |
| char rest[256]; |
| FILE *fp; |
| char line[1024]; |
| |
| if (!(fp = fopen("/proc/mounts", "r"))) { |
| SLOGE("Error opening /proc/mounts (%s)", strerror(errno)); |
| return false; |
| } |
| |
| while(fgets(line, sizeof(line), fp)) { |
| line[strlen(line)-1] = '\0'; |
| sscanf(line, "%255s %255s %255s\n", device, mount_path, rest); |
| if (!strcmp(mount_path, mp)) { |
| fclose(fp); |
| return true; |
| } |
| } |
| |
| fclose(fp); |
| return false; |
| } |
| |
| int VolumeManager::cleanupAsec(Volume *v, bool force) { |
| while(mActiveContainers->size()) { |
| AsecIdCollection::iterator it = mActiveContainers->begin(); |
| ContainerData* cd = *it; |
| SLOGI("Unmounting ASEC %s (dependant on %s)", cd->id, v->getMountpoint()); |
| if (cd->type == ASEC) { |
| if (unmountAsec(cd->id, force)) { |
| SLOGE("Failed to unmount ASEC %s (%s)", cd->id, strerror(errno)); |
| return -1; |
| } |
| } else if (cd->type == OBB) { |
| if (unmountObb(cd->id, force)) { |
| SLOGE("Failed to unmount OBB %s (%s)", cd->id, strerror(errno)); |
| return -1; |
| } |
| } else { |
| SLOGE("Unknown container type %d!", cd->type); |
| return -1; |
| } |
| } |
| return 0; |
| } |
| |
