| /* |
| * 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 <cutils/log.h> |
| |
| #include <sysutils/NetlinkEvent.h> |
| |
| #include "VolumeManager.h" |
| #include "DirectVolume.h" |
| #include "ResponseCode.h" |
| #include "Loop.h" |
| #include "Fat.h" |
| |
| VolumeManager *VolumeManager::sInstance = NULL; |
| |
| VolumeManager *VolumeManager::Instance() { |
| if (!sInstance) |
| sInstance = new VolumeManager(); |
| return sInstance; |
| } |
| |
| VolumeManager::VolumeManager() { |
| mBlockDevices = new BlockDeviceCollection(); |
| mVolumes = new VolumeCollection(); |
| mBroadcaster = NULL; |
| mUsbMassStorageConnected = false; |
| } |
| |
| VolumeManager::~VolumeManager() { |
| delete mBlockDevices; |
| } |
| |
| int VolumeManager::start() { |
| return 0; |
| } |
| |
| int VolumeManager::stop() { |
| return 0; |
| } |
| |
| int VolumeManager::addVolume(Volume *v) { |
| mVolumes->push_back(v); |
| return 0; |
| } |
| |
| void VolumeManager::notifyUmsConnected(bool connected) { |
| char msg[255]; |
| |
| if (connected) { |
| mUsbMassStorageConnected = true; |
| } else { |
| mUsbMassStorageConnected = false; |
| } |
| snprintf(msg, sizeof(msg), "Share method ums now %s", |
| (connected ? "available" : "unavailable")); |
| |
| 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) { |
| LOGW("Switch %s event missing name/state info", devpath); |
| return; |
| } |
| |
| if (!strcmp(name, "usb_mass_storage")) { |
| |
| if (!strcmp(state, "online")) { |
| notifyUmsConnected(true); |
| } else { |
| notifyUmsConnected(false); |
| } |
| } else { |
| LOGW("Ignoring unknown switch '%s'", name); |
| } |
| } |
| |
| 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 |
| LOGD("Device '%s' event handled by volume %s\n", devpath, (*it)->getLabel()); |
| #endif |
| hit = true; |
| break; |
| } |
| } |
| |
| if (!hit) { |
| #ifdef NETLINK_DEBUG |
| LOGW("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::getAsecMountPath(const char *id, char *buffer, int maxlen) { |
| char mountPoint[255]; |
| |
| snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id); |
| |
| if (!isMountpointMounted(mountPoint)) { |
| errno = ENOENT; |
| return -1; |
| } |
| snprintf(buffer, maxlen, "/asec/%s", id); |
| return 0; |
| } |
| |
| int VolumeManager::createAsec(const char *id, int sizeMb, |
| const char *fstype, const char *key, int ownerUid) { |
| |
| mkdir("/sdcard/android_secure", 0777); |
| |
| if (lookupVolume(id)) { |
| LOGE("ASEC volume '%s' currently exists", id); |
| errno = EADDRINUSE; |
| return -1; |
| } |
| |
| char asecFileName[255]; |
| snprintf(asecFileName, sizeof(asecFileName), |
| "/sdcard/android_secure/%s.asec", id); |
| |
| if (!access(asecFileName, F_OK)) { |
| LOGE("ASEC file '%s' currently exists - destroy it first! (%s)", |
| asecFileName, strerror(errno)); |
| errno = EADDRINUSE; |
| return -1; |
| } |
| |
| if (Loop::createImageFile(asecFileName, sizeMb)) { |
| LOGE("ASEC image file creation failed (%s)", strerror(errno)); |
| return -1; |
| } |
| |
| char loopDevice[255]; |
| if (Loop::getNextAvailable(loopDevice, sizeof(loopDevice))) { |
| unlink(asecFileName); |
| return -1; |
| } |
| |
| if (Loop::create(loopDevice, asecFileName)) { |
| LOGE("ASEC loop device creation failed (%s)", strerror(errno)); |
| unlink(asecFileName); |
| return -1; |
| } |
| |
| /* XXX: Start devmapper */ |
| |
| if (Fat::format(loopDevice)) { |
| LOGE("ASEC FAT format failed (%s)", strerror(errno)); |
| Loop::destroyByDevice(loopDevice); |
| unlink(asecFileName); |
| return -1; |
| } |
| |
| char mountPoint[255]; |
| |
| snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id); |
| if (mkdir(mountPoint, 0777)) { |
| LOGE("Mountpoint creation failed (%s)", strerror(errno)); |
| Loop::destroyByDevice(loopDevice); |
| unlink(asecFileName); |
| return -1; |
| } |
| |
| if (Fat::doMount(loopDevice, mountPoint, false, false)) { |
| LOGE("ASEC FAT mount failed (%s)", strerror(errno)); |
| Loop::destroyByDevice(loopDevice); |
| unlink(asecFileName); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| int VolumeManager::finalizeAsec(const char *id) { |
| char asecFileName[255]; |
| char loopDevice[255]; |
| char mountPoint[255]; |
| |
| snprintf(asecFileName, sizeof(asecFileName), |
| "/sdcard/android_secure/%s.asec", id); |
| |
| if (Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) { |
| LOGE("Unable to finalize %s (%s)", id, strerror(errno)); |
| return -1; |
| } |
| |
| snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id); |
| if (Fat::doMount(loopDevice, mountPoint, true, true)) { |
| LOGE("ASEC finalize mount failed (%s)", strerror(errno)); |
| return -1; |
| } |
| |
| LOGD("ASEC %s finalized", id); |
| return 0; |
| } |
| |
| int VolumeManager::destroyAsec(const char *id) { |
| char asecFileName[255]; |
| char mountPoint[255]; |
| |
| snprintf(asecFileName, sizeof(asecFileName), |
| "/sdcard/android_secure/%s.asec", id); |
| snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id); |
| |
| if (isMountpointMounted(mountPoint)) { |
| int i, rc; |
| for (i = 0; i < 10; i++) { |
| rc = umount(mountPoint); |
| if (!rc) { |
| break; |
| } |
| if (rc && (errno == EINVAL || errno == ENOENT)) { |
| rc = 0; |
| break; |
| } |
| LOGW("ASEC %s unmount attempt %d failed (%s)", |
| id, i +1, strerror(errno)); |
| usleep(1000 * 250); |
| } |
| if (rc) { |
| LOGE("Failed to unmount ASEC %s for destroy", id); |
| return -1; |
| } |
| } |
| |
| char loopDevice[255]; |
| if (!Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) { |
| Loop::destroyByDevice(loopDevice); |
| } |
| |
| unlink(asecFileName); |
| |
| LOGD("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), |
| "/sdcard/android_secure/%s.asec", id); |
| snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id); |
| |
| if (isMountpointMounted(mountPoint)) { |
| LOGE("ASEC %s already mounted", id); |
| errno = EBUSY; |
| return -1; |
| } |
| |
| char loopDevice[255]; |
| if (Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) { |
| if (Loop::getNextAvailable(loopDevice, sizeof(loopDevice))) { |
| LOGE("Unable to find loop device for ASEC mount"); |
| return -1; |
| } |
| |
| if (Loop::create(loopDevice, asecFileName)) { |
| LOGE("ASEC loop device creation failed (%s)", strerror(errno)); |
| return -1; |
| } |
| } |
| |
| if (mkdir(mountPoint, 0777)) { |
| LOGE("Mountpoint creation failed (%s)", strerror(errno)); |
| return -1; |
| } |
| |
| if (Fat::doMount(loopDevice, mountPoint, true, false)) { |
| LOGE("ASEC mount failed (%s)", strerror(errno)); |
| return -1; |
| } |
| |
| LOGD("ASEC %s mounted", id); |
| return 0; |
| } |
| |
| int VolumeManager::mountVolume(const char *label) { |
| Volume *v = lookupVolume(label); |
| |
| if (!v) { |
| errno = ENOENT; |
| return -1; |
| } |
| |
| return v->mountVol(); |
| } |
| |
| int VolumeManager::shareAvailable(const char *method, bool *avail) { |
| |
| if (strcmp(method, "ums")) { |
| errno = ENOSYS; |
| return -1; |
| } |
| |
| if (mUsbMassStorageConnected) |
| *avail = true; |
| else |
| *avail = false; |
| return 0; |
| } |
| |
| int VolumeManager::simulate(const char *cmd, const char *arg) { |
| |
| if (!strcmp(cmd, "ums")) { |
| if (!strcmp(arg, "connect")) { |
| notifyUmsConnected(true); |
| } else if (!strcmp(arg, "disconnect")) { |
| notifyUmsConnected(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->getDiskDevice(); |
| 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) { |
| LOGE("Unable to open ums lunfile (%s)", strerror(errno)); |
| return -1; |
| } |
| |
| if (write(fd, nodepath, strlen(nodepath)) < 0) { |
| LOGE("Unable to write to ums lunfile (%s)", strerror(errno)); |
| close(fd); |
| return -1; |
| } |
| |
| close(fd); |
| v->handleVolumeShared(); |
| 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; |
| } |
| |
| dev_t d = v->getDiskDevice(); |
| |
| 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) { |
| LOGE("Unable to open ums lunfile (%s)", strerror(errno)); |
| return -1; |
| } |
| |
| char ch = 0; |
| if (write(fd, &ch, 1) < 0) { |
| LOGE("Unable to write to ums lunfile (%s)", strerror(errno)); |
| close(fd); |
| return -1; |
| } |
| |
| close(fd); |
| v->handleVolumeUnshared(); |
| return 0; |
| } |
| |
| int VolumeManager::unmountVolume(const char *label) { |
| 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) { |
| LOGW("Attempt to unmount volume which isn't mounted (%d)\n", |
| v->getState()); |
| errno = EBUSY; |
| return -1; |
| } |
| |
| return v->unmountVol(); |
| } |
| |
| /* |
| * 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"))) { |
| LOGE("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; |
| } |
| |
