/*
* 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 <fts.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <dirent.h>
#include <linux/kdev_t.h>
#define LOG_TAG "Vold"
#include <openssl/md5.h>
#include <cutils/log.h>
#include <sysutils/NetlinkEvent.h>
#include <private/android_filesystem_config.h>
#include "VolumeManager.h"
#include "DirectVolume.h"
#include "ResponseCode.h"
#include "Loop.h"
#include "Ext4.h"
#include "Fat.h"
#include "Devmapper.h"
#include "Process.h"
#include "Asec.h"
#include "cryptfs.h"
#define MASS_STORAGE_FILE_PATH "/sys/class/android_usb/android0/f_mass_storage/lun/file"
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;
mUmsSharingCount = 0;
mSavedDirtyRatio = -1;
// set dirty ratio to 0 when UMS is active
mUmsDirtyRatio = 0;
mVolManagerDisabled = 0;
}
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::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;
}
if (mVolManagerDisabled) {
errno = EBUSY;
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);
int written = snprintf(mountPath, mountPathLen, "%s/%s", Volume::LOOPDIR, idHash);
if ((written < 0) || (written >= mountPathLen)) {
errno = EINVAL;
return -1;
}
if (access(mountPath, F_OK)) {
errno = ENOENT;
return -1;
}
return 0;
}
int VolumeManager::getAsecMountPath(const char *id, char *buffer, int maxlen) {
char asecFileName[255];
if (findAsec(id, asecFileName, sizeof(asecFileName))) {
SLOGE("Couldn't find ASEC %s", id);
return -1;
}
memset(buffer, 0, maxlen);
if (access(asecFileName, F_OK)) {
errno = ENOENT;
return -1;
}
int written = snprintf(buffer, maxlen, "%s/%s", Volume::ASECDIR, id);
if ((written < 0) || (written >= maxlen)) {
SLOGE("getAsecMountPath failed for %s: couldn't construct path in buffer", id);
errno = EINVAL;
return -1;
}
return 0;
}
int VolumeManager::getAsecFilesystemPath(const char *id, char *buffer, int maxlen) {
char asecFileName[255];
if (findAsec(id, asecFileName, sizeof(asecFileName))) {
SLOGE("Couldn't find ASEC %s", id);
return -1;
}
memset(buffer, 0, maxlen);
if (access(asecFileName, F_OK)) {
errno = ENOENT;
return -1;
}
int written = snprintf(buffer, maxlen, "%s", asecFileName);
if ((written < 0) || (written >= maxlen)) {
errno = EINVAL;
return -1;
}
return 0;
}
int VolumeManager::createAsec(const char *id, unsigned int numSectors, const char *fstype,
const char *key, const int ownerUid, bool isExternal) {
struct asec_superblock sb;
memset(&sb, 0, sizeof(sb));
const bool wantFilesystem = strcmp(fstype, "none");
bool usingExt4 = false;
if (wantFilesystem) {
usingExt4 = !strcmp(fstype, "ext4");
if (usingExt4) {
sb.c_opts |= ASEC_SB_C_OPTS_EXT4;
} else if (strcmp(fstype, "fat")) {
SLOGE("Invalid filesystem type %s", fstype);
errno = EINVAL;
return -1;
}
}
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];
if (!findAsec(id, asecFileName, sizeof(asecFileName))) {
SLOGE("ASEC file '%s' currently exists - destroy it first! (%s)",
asecFileName, strerror(errno));
errno = EADDRINUSE;
return -1;
}
const char *asecDir = isExternal ? Volume::SEC_ASECDIR_EXT : Volume::SEC_ASECDIR_INT;
int written = snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", asecDir, id);
if ((written < 0) || (size_t(written) >= sizeof(asecFileName))) {
errno = EINVAL;
return -1;
}
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 (wantFilesystem) {
int formatStatus;
char mountPoint[255];
int written = snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id);
if ((written < 0) || (size_t(written) >= sizeof(mountPoint))) {
SLOGE("ASEC fs format failed: couldn't construct mountPoint");
if (cleanupDm) {
Devmapper::destroy(idHash);
}
Loop::destroyByDevice(loopDevice);
unlink(asecFileName);
return -1;
}
if (usingExt4) {
formatStatus = Ext4::format(dmDevice, mountPoint);
} else {
formatStatus = Fat::format(dmDevice, numImgSectors);
}
if (formatStatus < 0) {
SLOGE("ASEC fs format failed (%s)", strerror(errno));
if (cleanupDm) {
Devmapper::destroy(idHash);
}
Loop::destroyByDevice(loopDevice);
unlink(asecFileName);
return -1;
}
if (mkdir(mountPoint, 0000)) {
if (errno != EEXIST) {
SLOGE("Mountpoint creation failed (%s)", strerror(errno));
if (cleanupDm) {
Devmapper::destroy(idHash);
}
Loop::destroyByDevice(loopDevice);
unlink(asecFileName);
return -1;
}
}
int mountStatus;
if (usingExt4) {
mountStatus = Ext4::doMount(dmDevice, mountPoint, false, false, false);
} else {
mountStatus = Fat::doMount(dmDevice, mountPoint, false, false, false, ownerUid, 0, 0000,
false);
}
if (mountStatus) {
SLOGE("ASEC FAT mount failed (%s)", strerror(errno));
if (cleanupDm) {
Devmapper::destroy(idHash);
}
Loop::destroyByDevice(loopDevice);
unlink(asecFileName);
return -1;
}
if (usingExt4) {
int dirfd = open(mountPoint, O_DIRECTORY);
if (dirfd >= 0) {
if (fchown(dirfd, ownerUid, AID_SYSTEM)
|| fchmod(dirfd, S_IRUSR | S_IWUSR | S_IXUSR | S_ISGID | S_IRGRP | S_IXGRP)) {
SLOGI("Cannot chown/chmod new ASEC mount point %s", mountPoint);
}
close(dirfd);
}
}
} 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];
if (findAsec(id, asecFileName, sizeof(asecFileName))) {
SLOGE("Couldn't find ASEC %s", id);
return -1;
}
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;
}
unsigned int nr_sec = 0;
struct asec_superblock sb;
if (Loop::lookupInfo(loopDevice, &sb, &nr_sec)) {
return -1;
}
int written = snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id);
if ((written < 0) || (size_t(written) >= sizeof(mountPoint))) {
SLOGE("ASEC finalize failed: couldn't construct mountPoint");
return -1;
}
int result = 0;
if (sb.c_opts & ASEC_SB_C_OPTS_EXT4) {
result = Ext4::doMount(loopDevice, mountPoint, true, true, true);
} else {
result = Fat::doMount(loopDevice, mountPoint, true, true, true, 0, 0, 0227, false);
}
if (result) {
SLOGE("ASEC finalize mount failed (%s)", strerror(errno));
return -1;
}
if (mDebug) {
SLOGD("ASEC %s finalized", id);
}
return 0;
}
int VolumeManager::fixupAsecPermissions(const char *id, gid_t gid, const char* filename) {
char asecFileName[255];
char loopDevice[255];
char mountPoint[255];
if (gid < AID_APP) {
SLOGE("Group ID is not in application range");
return -1;
}
if (findAsec(id, asecFileName, sizeof(asecFileName))) {
SLOGE("Couldn't find ASEC %s", id);
return -1;
}
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 fix permissions during lookup on %s (%s)", id, strerror(errno));
return -1;
}
unsigned int nr_sec = 0;
struct asec_superblock sb;
if (Loop::lookupInfo(loopDevice, &sb, &nr_sec)) {
return -1;
}
int written = snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id);
if ((written < 0) || (size_t(written) >= sizeof(mountPoint))) {
SLOGE("Unable remount to fix permissions for %s: couldn't construct mountpoint", id);
return -1;
}
int result = 0;
if ((sb.c_opts & ASEC_SB_C_OPTS_EXT4) == 0) {
return 0;
}
int ret = Ext4::doMount(loopDevice, mountPoint,
false /* read-only */,
true /* remount */,
false /* executable */);
if (ret) {
SLOGE("Unable remount to fix permissions for %s (%s)", id, strerror(errno));
return -1;
}
char *paths[] = { mountPoint, NULL };
FTS *fts = fts_open(paths, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, NULL);
if (fts) {
// Traverse the entire hierarchy and chown to system UID.
for (FTSENT *ftsent = fts_read(fts); ftsent != NULL; ftsent = fts_read(fts)) {
// We don't care about the lost+found directory.
if (!strcmp(ftsent->fts_name, "lost+found")) {
continue;
}
/*
* There can only be one file marked as private right now.
* This should be more robust, but it satisfies the requirements
* we have for right now.
*/
const bool privateFile = !strcmp(ftsent->fts_name, filename);
int fd = open(ftsent->fts_accpath, O_NOFOLLOW);
if (fd < 0) {
SLOGE("Couldn't open file %s: %s", ftsent->fts_accpath, strerror(errno));
result = -1;
continue;
}
result |= fchown(fd, AID_SYSTEM, privateFile? gid : AID_SYSTEM);
if (ftsent->fts_info & FTS_D) {
result |= fchmod(fd, 0755);
} else if (ftsent->fts_info & FTS_F) {
result |= fchmod(fd, privateFile ? 0640 : 0644);
}
close(fd);
}
fts_close(fts);
// Finally make the directory readable by everyone.
int dirfd = open(mountPoint, O_DIRECTORY);
if (dirfd < 0 || fchmod(dirfd, 0755)) {
SLOGE("Couldn't change owner of existing directory %s: %s", mountPoint, strerror(errno));
result |= -1;
}
close(dirfd);
} else {
result |= -1;
}
result |= Ext4::doMount(loopDevice, mountPoint,
true /* read-only */,
true /* remount */,
true /* execute */);
if (result) {
SLOGE("ASEC fix permissions failed (%s)", strerror(errno));
return -1;
}
if (mDebug) {
SLOGD("ASEC %s permissions fixed", id);
}
return 0;
}
int VolumeManager::renameAsec(const char *id1, const char *id2) {
char asecFilename1[255];
char *asecFilename2;
char mountPoint[255];
const char *dir;
if (findAsec(id1, asecFilename1, sizeof(asecFilename1), &dir)) {
SLOGE("Couldn't find ASEC %s", id1);
return -1;
}
asprintf(&asecFilename2, "%s/%s.asec", dir, id2);
int written = snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id1);
if ((written < 0) || (size_t(written) >= sizeof(mountPoint))) {
SLOGE("Rename failed: couldn't construct mountpoint");
goto out_err;
}
if (isMountpointMounted(mountPoint)) {
SLOGW("Rename attempt when src mounted");
errno = EBUSY;
goto out_err;
}
written = snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id2);
if ((written < 0) || (size_t(written) >= sizeof(mountPoint))) {
SLOGE("Rename failed: couldn't construct mountpoint2");
goto out_err;
}
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(asecFilename2);
return 0;
out_err:
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];
if (findAsec(id, asecFileName, sizeof(asecFileName))) {
SLOGE("Couldn't find ASEC %s", id);
return -1;
}
int written = snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id);
if ((written < 0) || (size_t(written) >= sizeof(mountPoint))) {
SLOGE("ASEC unmount failed for %s: couldn't construct mountpoint", id);
return -1;
}
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;
}
int written = snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::LOOPDIR, idHash);
if ((written < 0) || (size_t(written) >= sizeof(mountPoint))) {
SLOGE("OBB unmount failed for %s: couldn't construct mountpoint", fileName);
return -1;
}
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];
if (findAsec(id, asecFileName, sizeof(asecFileName))) {
SLOGE("Couldn't find ASEC %s", id);
return -1;
}
int written = snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id);
if ((written < 0) || (size_t(written) >= sizeof(mountPoint))) {
SLOGE("ASEC destroy failed for %s: couldn't construct mountpoint", id);
return -1;
}
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;
}
bool VolumeManager::isAsecInDirectory(const char *dir, const char *asecName) const {
int dirfd = open(dir, O_DIRECTORY);
if (dirfd < 0) {
SLOGE("Couldn't open internal ASEC dir (%s)", strerror(errno));
return -1;
}
bool ret = false;
if (!faccessat(dirfd, asecName, F_OK, AT_SYMLINK_NOFOLLOW)) {
ret = true;
}
close(dirfd);
return ret;
}
int VolumeManager::findAsec(const char *id, char *asecPath, size_t asecPathLen,
const char **directory) const {
int dirfd, fd;
const int idLen = strlen(id);
char *asecName;
if (asprintf(&asecName, "%s.asec", id) < 0) {
SLOGE("Couldn't allocate string to write ASEC name");
return -1;
}
const char *dir;
if (isAsecInDirectory(Volume::SEC_ASECDIR_INT, asecName)) {
dir = Volume::SEC_ASECDIR_INT;
} else if (isAsecInDirectory(Volume::SEC_ASECDIR_EXT, asecName)) {
dir = Volume::SEC_ASECDIR_EXT;
} else {
free(asecName);
return -1;
}
if (directory != NULL) {
*directory = dir;
}
if (asecPath != NULL) {
int written = snprintf(asecPath, asecPathLen, "%s/%s", dir, asecName);
if ((written < 0) || (size_t(written) >= asecPathLen)) {
SLOGE("findAsec failed for %s: couldn't construct ASEC path", id);
free(asecName);
return -1;
}
}
free(asecName);
return 0;
}
int VolumeManager::mountAsec(const char *id, const char *key, int ownerUid) {
char asecFileName[255];
char mountPoint[255];
if (findAsec(id, asecFileName, sizeof(asecFileName))) {
SLOGE("Couldn't find ASEC %s", id);
return -1;
}
int written = snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id);
if ((written < 0) || (size_t(written) >= sizeof(mountPoint))) {
SLOGE("ASEC mount failed: couldn't construct mountpoint", id);
return -1;
}
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;
struct asec_superblock sb;
if (Loop::lookupInfo(loopDevice, &sb, &nr_sec)) {
return -1;
}
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, 0000)) {
if (errno != EEXIST) {
SLOGE("Mountpoint creation failed (%s)", strerror(errno));
if (cleanupDm) {
Devmapper::destroy(idHash);
}
Loop::destroyByDevice(loopDevice);
return -1;
}
}
/*
* The device mapper node needs to be created. Sometimes it takes a
* while. Wait for up to 1 second. We could also inspect incoming uevents,
* but that would take more effort.
*/
int tries = 25;
while (tries--) {
if (!access(dmDevice, F_OK) || errno != ENOENT) {
break;
}
usleep(40 * 1000);
}
int result;
if (sb.c_opts & ASEC_SB_C_OPTS_EXT4) {
result = Ext4::doMount(dmDevice, mountPoint, true, false, true);
} else {
result = Fat::doMount(dmDevice, mountPoint, true, false, true, ownerUid, 0, 0222, false);
}
if (result) {
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;
}
Volume* VolumeManager::getVolumeForFile(const char *fileName) {
VolumeCollection::iterator i;
for (i = mVolumes->begin(); i != mVolumes->end(); ++i) {
const char* mountPoint = (*i)->getMountpoint();
if (!strncmp(fileName, mountPoint, strlen(mountPoint))) {
return *i;
}
}
return NULL;
}
/**
* Mounts an image file <code>img</code>.
*/
int VolumeManager::mountObb(const char *img, const char *key, int ownerGid) {
char mountPoint[255];
char idHash[33];
if (!asecHash(img, idHash, sizeof(idHash))) {
SLOGE("Hash of '%s' failed (%s)", img, strerror(errno));
return -1;
}
int written = snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::LOOPDIR, idHash);
if ((written < 0) || (size_t(written) >= sizeof(mountPoint))) {
SLOGE("OBB mount failed: couldn't construct mountpoint", img);
return -1;
}
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, 0, ownerGid,
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 = strlen(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::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::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;
}
if (mVolManagerDisabled) {
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];
int written = snprintf(nodepath,
sizeof(nodepath), "/dev/block/vold/%d:%d",
MAJOR(d), MINOR(d));
if ((written < 0) || (size_t(written) >= sizeof(nodepath))) {
SLOGE("shareVolume failed: couldn't construct nodepath");
return -1;
}
if ((fd = open(MASS_STORAGE_FILE_PATH, 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(MASS_STORAGE_FILE_PATH, 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;
}
extern "C" int vold_disableVol(const char *label) {
VolumeManager *vm = VolumeManager::Instance();
vm->disableVolumeManager();
vm->unshareVolume(label, "ums");
return vm->unmountVolume(label, true, false);
}
extern "C" int vold_getNumDirectVolumes(void) {
VolumeManager *vm = VolumeManager::Instance();
return vm->getNumDirectVolumes();
}
int VolumeManager::getNumDirectVolumes(void) {
VolumeCollection::iterator i;
int n=0;
for (i = mVolumes->begin(); i != mVolumes->end(); ++i) {
if ((*i)->getShareDevice() != (dev_t)0) {
n++;
}
}
return n;
}
extern "C" int vold_getDirectVolumeList(struct volume_info *vol_list) {
VolumeManager *vm = VolumeManager::Instance();
return vm->getDirectVolumeList(vol_list);
}
int VolumeManager::getDirectVolumeList(struct volume_info *vol_list) {
VolumeCollection::iterator i;
int n=0;
dev_t d;
for (i = mVolumes->begin(); i != mVolumes->end(); ++i) {
if ((d=(*i)->getShareDevice()) != (dev_t)0) {
(*i)->getVolInfo(&vol_list[n]);
snprintf(vol_list[n].blk_dev, sizeof(vol_list[n].blk_dev),
"/dev/block/vold/%d:%d",MAJOR(d), MINOR(d));
n++;
}
}
return 0;
}
int VolumeManager::unmountVolume(const char *label, bool force, bool revert) {
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 UNMOUNT_NOT_MOUNTED_ERR;
}
cleanupAsec(v, force);
return v->unmountVol(force, revert);
}
extern "C" int vold_unmountAllAsecs(void) {
int rc;
VolumeManager *vm = VolumeManager::Instance();
rc = vm->unmountAllAsecsInDir(Volume::SEC_ASECDIR_EXT);
if (vm->unmountAllAsecsInDir(Volume::SEC_ASECDIR_INT)) {
rc = -1;
}
return rc;
}
#define ID_BUF_LEN 256
#define ASEC_SUFFIX ".asec"
#define ASEC_SUFFIX_LEN (sizeof(ASEC_SUFFIX) - 1)
int VolumeManager::unmountAllAsecsInDir(const char *directory) {
DIR *d = opendir(directory);
int rc = 0;
if (!d) {
SLOGE("Could not open asec dir %s", directory);
return -1;
}
size_t dirent_len = offsetof(struct dirent, d_name) +
fpathconf(dirfd(d), _PC_NAME_MAX) + 1;
struct dirent *dent = (struct dirent *) malloc(dirent_len);
if (dent == NULL) {
SLOGE("Failed to allocate memory for asec dir");
return -1;
}
struct dirent *result;
while (!readdir_r(d, dent, &result) && result != NULL) {
if (dent->d_name[0] == '.')
continue;
if (dent->d_type != DT_REG)
continue;
size_t name_len = strlen(dent->d_name);
if (name_len > 5 && name_len < (ID_BUF_LEN + ASEC_SUFFIX_LEN - 1) &&
!strcmp(&dent->d_name[name_len - 5], ASEC_SUFFIX)) {
char id[ID_BUF_LEN];
strlcpy(id, dent->d_name, name_len - 4);
if (unmountAsec(id, true)) {
/* Register the error, but try to unmount more asecs */
rc = -1;
}
}
}
closedir(d);
free(dent);
return rc;
}
/*
* 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) {
int rc = unmountAllAsecsInDir(Volume::SEC_ASECDIR_EXT);
AsecIdCollection toUnmount;
// Find the remaining OBB files that are on external storage.
for (AsecIdCollection::iterator it = mActiveContainers->begin(); it != mActiveContainers->end();
++it) {
ContainerData* cd = *it;
if (cd->type == ASEC) {
// nothing
} else if (cd->type == OBB) {
if (v == getVolumeForFile(cd->id)) {
toUnmount.push_back(cd);
}
} else {
SLOGE("Unknown container type %d!", cd->type);
}
}
for (AsecIdCollection::iterator it = toUnmount.begin(); it != toUnmount.end(); ++it) {
ContainerData *cd = *it;
SLOGI("Unmounting ASEC %s (dependant on %s)", cd->id, v->getMountpoint());
if (unmountObb(cd->id, force)) {
SLOGE("Failed to unmount OBB %s (%s)", cd->id, strerror(errno));
rc = -1;
}
}
return rc;
}