/*
* 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 <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/param.h>
#include <linux/kdev_t.h>
#include <cutils/properties.h>
#include <diskconfig/diskconfig.h>
#include <private/android_filesystem_config.h>
#define LOG_TAG "Vold"
#include <cutils/fs.h>
#include <cutils/log.h>
#include <string>
#include "Volume.h"
#include "VolumeManager.h"
#include "ResponseCode.h"
#include "Fat.h"
#include "Process.h"
#include "cryptfs.h"
extern "C" void dos_partition_dec(void const *pp, struct dos_partition *d);
extern "C" void dos_partition_enc(void *pp, struct dos_partition *d);
/*
* Media directory - stuff that only media_rw user can see
*/
const char *Volume::MEDIA_DIR = "/mnt/media_rw";
/*
* Fuse directory - location where fuse wrapped filesystems go
*/
const char *Volume::FUSE_DIR = "/storage";
/*
* Path to external storage where *only* root can access ASEC image files
*/
const char *Volume::SEC_ASECDIR_EXT = "/mnt/secure/asec";
/*
* Path to internal storage where *only* root can access ASEC image files
*/
const char *Volume::SEC_ASECDIR_INT = "/data/app-asec";
/*
* Path to where secure containers are mounted
*/
const char *Volume::ASECDIR = "/mnt/asec";
/*
* Path to where OBBs are mounted
*/
const char *Volume::LOOPDIR = "/mnt/obb";
const char *Volume::BLKID_PATH = "/system/bin/blkid";
static const char *stateToStr(int state) {
if (state == Volume::State_Init)
return "Initializing";
else if (state == Volume::State_NoMedia)
return "No-Media";
else if (state == Volume::State_Idle)
return "Idle-Unmounted";
else if (state == Volume::State_Pending)
return "Pending";
else if (state == Volume::State_Mounted)
return "Mounted";
else if (state == Volume::State_Unmounting)
return "Unmounting";
else if (state == Volume::State_Checking)
return "Checking";
else if (state == Volume::State_Formatting)
return "Formatting";
else if (state == Volume::State_Shared)
return "Shared-Unmounted";
else if (state == Volume::State_SharedMnt)
return "Shared-Mounted";
else
return "Unknown-Error";
}
Volume::Volume(VolumeManager *vm, const fstab_rec* rec, int flags) {
mVm = vm;
mDebug = false;
mLabel = strdup(rec->label);
mUuid = NULL;
mUserLabel = NULL;
mState = Volume::State_Init;
mFlags = flags;
mCurrentlyMountedKdev = -1;
mPartIdx = rec->partnum;
mRetryMount = false;
}
Volume::~Volume() {
free(mLabel);
free(mUuid);
free(mUserLabel);
}
void Volume::setDebug(bool enable) {
mDebug = enable;
}
dev_t Volume::getDiskDevice() {
return MKDEV(0, 0);
};
dev_t Volume::getShareDevice() {
return getDiskDevice();
}
void Volume::handleVolumeShared() {
}
void Volume::handleVolumeUnshared() {
}
int Volume::handleBlockEvent(NetlinkEvent * /*evt*/) {
errno = ENOSYS;
return -1;
}
void Volume::setUuid(const char* uuid) {
char msg[256];
if (mUuid) {
free(mUuid);
}
if (uuid) {
mUuid = strdup(uuid);
snprintf(msg, sizeof(msg), "%s %s \"%s\"", getLabel(),
getFuseMountpoint(), mUuid);
} else {
mUuid = NULL;
snprintf(msg, sizeof(msg), "%s %s", getLabel(), getFuseMountpoint());
}
mVm->getBroadcaster()->sendBroadcast(ResponseCode::VolumeUuidChange, msg,
false);
}
void Volume::setUserLabel(const char* userLabel) {
char msg[256];
if (mUserLabel) {
free(mUserLabel);
}
if (userLabel) {
mUserLabel = strdup(userLabel);
snprintf(msg, sizeof(msg), "%s %s \"%s\"", getLabel(),
getFuseMountpoint(), mUserLabel);
} else {
mUserLabel = NULL;
snprintf(msg, sizeof(msg), "%s %s", getLabel(), getFuseMountpoint());
}
mVm->getBroadcaster()->sendBroadcast(ResponseCode::VolumeUserLabelChange,
msg, false);
}
void Volume::setState(int state) {
char msg[255];
int oldState = mState;
if (oldState == state) {
SLOGW("Duplicate state (%d)\n", state);
return;
}
if ((oldState == Volume::State_Pending) && (state != Volume::State_Idle)) {
mRetryMount = false;
}
mState = state;
SLOGD("Volume %s state changing %d (%s) -> %d (%s)", mLabel,
oldState, stateToStr(oldState), mState, stateToStr(mState));
snprintf(msg, sizeof(msg),
"Volume %s %s state changed from %d (%s) to %d (%s)", getLabel(),
getFuseMountpoint(), oldState, stateToStr(oldState), mState,
stateToStr(mState));
mVm->getBroadcaster()->sendBroadcast(ResponseCode::VolumeStateChange,
msg, false);
}
int Volume::createDeviceNode(const char *path, int major, int minor) {
mode_t mode = 0660 | S_IFBLK;
dev_t dev = (major << 8) | minor;
if (mknod(path, mode, dev) < 0) {
if (errno != EEXIST) {
return -1;
}
}
return 0;
}
int Volume::formatVol(bool wipe) {
if (getState() == Volume::State_NoMedia) {
errno = ENODEV;
return -1;
} else if (getState() != Volume::State_Idle) {
errno = EBUSY;
return -1;
}
if (isMountpointMounted(getMountpoint())) {
SLOGW("Volume is idle but appears to be mounted - fixing");
setState(Volume::State_Mounted);
// mCurrentlyMountedKdev = XXX
errno = EBUSY;
return -1;
}
bool formatEntireDevice = (mPartIdx == -1);
char devicePath[255];
dev_t diskNode = getDiskDevice();
dev_t partNode =
MKDEV(MAJOR(diskNode),
MINOR(diskNode) + (formatEntireDevice ? 1 : mPartIdx));
setState(Volume::State_Formatting);
int ret = -1;
// Only initialize the MBR if we are formatting the entire device
if (formatEntireDevice) {
sprintf(devicePath, "/dev/block/vold/%d:%d",
major(diskNode), minor(diskNode));
if (initializeMbr(devicePath)) {
SLOGE("Failed to initialize MBR (%s)", strerror(errno));
goto err;
}
}
sprintf(devicePath, "/dev/block/vold/%d:%d",
major(partNode), minor(partNode));
if (mDebug) {
SLOGI("Formatting volume %s (%s)", getLabel(), devicePath);
}
if (Fat::format(devicePath, 0, wipe)) {
SLOGE("Failed to format (%s)", strerror(errno));
goto err;
}
ret = 0;
err:
setState(Volume::State_Idle);
return ret;
}
bool Volume::isMountpointMounted(const char *path) {
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, path)) {
fclose(fp);
return true;
}
}
fclose(fp);
return false;
}
int Volume::mountVol() {
dev_t deviceNodes[4];
int n, i, rc = 0;
char errmsg[255];
int flags = getFlags();
bool providesAsec = (flags & VOL_PROVIDES_ASEC) != 0;
// TODO: handle "bind" style mounts, for emulated storage
char decrypt_state[PROPERTY_VALUE_MAX];
char crypto_state[PROPERTY_VALUE_MAX];
char encrypt_progress[PROPERTY_VALUE_MAX];
property_get("vold.decrypt", decrypt_state, "");
property_get("vold.encrypt_progress", encrypt_progress, "");
/* Don't try to mount the volumes if we have not yet entered the disk password
* or are in the process of encrypting.
*/
if ((getState() == Volume::State_NoMedia) ||
((!strcmp(decrypt_state, "1") || encrypt_progress[0]) && providesAsec)) {
snprintf(errmsg, sizeof(errmsg),
"Volume %s %s mount failed - no media",
getLabel(), getFuseMountpoint());
mVm->getBroadcaster()->sendBroadcast(
ResponseCode::VolumeMountFailedNoMedia,
errmsg, false);
errno = ENODEV;
return -1;
} else if (getState() != Volume::State_Idle) {
errno = EBUSY;
if (getState() == Volume::State_Pending) {
mRetryMount = true;
}
return -1;
}
if (isMountpointMounted(getMountpoint())) {
SLOGW("Volume is idle but appears to be mounted - fixing");
setState(Volume::State_Mounted);
// mCurrentlyMountedKdev = XXX
return 0;
}
n = getDeviceNodes((dev_t *) &deviceNodes, 4);
if (!n) {
SLOGE("Failed to get device nodes (%s)\n", strerror(errno));
return -1;
}
/* If we're running encrypted, and the volume is marked as encryptable and nonremovable,
* and also marked as providing Asec storage, then we need to decrypt
* that partition, and update the volume object to point to it's new decrypted
* block device
*/
property_get("ro.crypto.state", crypto_state, "");
if (providesAsec &&
((flags & (VOL_NONREMOVABLE | VOL_ENCRYPTABLE))==(VOL_NONREMOVABLE | VOL_ENCRYPTABLE)) &&
!strcmp(crypto_state, "encrypted") && !isDecrypted()) {
char new_sys_path[MAXPATHLEN];
char nodepath[256];
int new_major, new_minor;
if (n != 1) {
/* We only expect one device node returned when mounting encryptable volumes */
SLOGE("Too many device nodes returned when mounting %s\n", getMountpoint());
return -1;
}
if (cryptfs_setup_volume(getLabel(), MAJOR(deviceNodes[0]), MINOR(deviceNodes[0]),
new_sys_path, sizeof(new_sys_path),
&new_major, &new_minor)) {
SLOGE("Cannot setup encryption mapping for %s\n", getMountpoint());
return -1;
}
/* We now have the new sysfs path for the decrypted block device, and the
* majore and minor numbers for it. So, create the device, update the
* path to the new sysfs path, and continue.
*/
snprintf(nodepath,
sizeof(nodepath), "/dev/block/vold/%d:%d",
new_major, new_minor);
if (createDeviceNode(nodepath, new_major, new_minor)) {
SLOGE("Error making device node '%s' (%s)", nodepath,
strerror(errno));
}
// Todo: Either create sys filename from nodepath, or pass in bogus path so
// vold ignores state changes on this internal device.
updateDeviceInfo(nodepath, new_major, new_minor);
/* Get the device nodes again, because they just changed */
n = getDeviceNodes((dev_t *) &deviceNodes, 4);
if (!n) {
SLOGE("Failed to get device nodes (%s)\n", strerror(errno));
return -1;
}
}
for (i = 0; i < n; i++) {
char devicePath[255];
sprintf(devicePath, "/dev/block/vold/%d:%d", major(deviceNodes[i]),
minor(deviceNodes[i]));
SLOGI("%s being considered for volume %s\n", devicePath, getLabel());
errno = 0;
setState(Volume::State_Checking);
if (Fat::check(devicePath)) {
if (errno == ENODATA) {
SLOGW("%s does not contain a FAT filesystem\n", devicePath);
continue;
}
errno = EIO;
/* Badness - abort the mount */
SLOGE("%s failed FS checks (%s)", devicePath, strerror(errno));
setState(Volume::State_Idle);
return -1;
}
errno = 0;
int gid;
if (Fat::doMount(devicePath, getMountpoint(), false, false, false,
AID_MEDIA_RW, AID_MEDIA_RW, 0007, true)) {
SLOGE("%s failed to mount via VFAT (%s)\n", devicePath, strerror(errno));
continue;
}
extractMetadata(devicePath);
if (providesAsec && mountAsecExternal() != 0) {
SLOGE("Failed to mount secure area (%s)", strerror(errno));
umount(getMountpoint());
setState(Volume::State_Idle);
return -1;
}
char service[64];
snprintf(service, 64, "fuse_%s", getLabel());
property_set("ctl.start", service);
setState(Volume::State_Mounted);
mCurrentlyMountedKdev = deviceNodes[i];
return 0;
}
SLOGE("Volume %s found no suitable devices for mounting :(\n", getLabel());
setState(Volume::State_Idle);
return -1;
}
int Volume::mountAsecExternal() {
char legacy_path[PATH_MAX];
char secure_path[PATH_MAX];
snprintf(legacy_path, PATH_MAX, "%s/android_secure", getMountpoint());
snprintf(secure_path, PATH_MAX, "%s/.android_secure", getMountpoint());
// Recover legacy secure path
if (!access(legacy_path, R_OK | X_OK) && access(secure_path, R_OK | X_OK)) {
if (rename(legacy_path, secure_path)) {
SLOGE("Failed to rename legacy asec dir (%s)", strerror(errno));
}
}
if (fs_prepare_dir(secure_path, 0770, AID_MEDIA_RW, AID_MEDIA_RW) != 0) {
SLOGW("fs_prepare_dir failed: %s", strerror(errno));
return -1;
}
if (mount(secure_path, SEC_ASECDIR_EXT, "", MS_BIND, NULL)) {
SLOGE("Failed to bind mount points %s -> %s (%s)", secure_path,
SEC_ASECDIR_EXT, strerror(errno));
return -1;
}
return 0;
}
int Volume::doUnmount(const char *path, bool force) {
int retries = 10;
if (mDebug) {
SLOGD("Unmounting {%s}, force = %d", path, force);
}
while (retries--) {
if (!umount(path) || errno == EINVAL || errno == ENOENT) {
SLOGI("%s sucessfully unmounted", path);
return 0;
}
int action = 0;
if (force) {
if (retries == 1) {
action = 2; // SIGKILL
} else if (retries == 2) {
action = 1; // SIGHUP
}
}
SLOGW("Failed to unmount %s (%s, retries %d, action %d)",
path, strerror(errno), retries, action);
Process::killProcessesWithOpenFiles(path, action);
usleep(1000*1000);
}
errno = EBUSY;
SLOGE("Giving up on unmount %s (%s)", path, strerror(errno));
return -1;
}
int Volume::unmountVol(bool force, bool revert) {
int i, rc;
int flags = getFlags();
bool providesAsec = (flags & VOL_PROVIDES_ASEC) != 0;
if (getState() != Volume::State_Mounted) {
SLOGE("Volume %s unmount request when not mounted", getLabel());
errno = EINVAL;
return UNMOUNT_NOT_MOUNTED_ERR;
}
setState(Volume::State_Unmounting);
usleep(1000 * 1000); // Give the framework some time to react
char service[64];
snprintf(service, 64, "fuse_%s", getLabel());
property_set("ctl.stop", service);
/* Give it a chance to stop. I wish we had a synchronous way to determine this... */
sleep(1);
// TODO: determine failure mode if FUSE times out
if (providesAsec && doUnmount(Volume::SEC_ASECDIR_EXT, force) != 0) {
SLOGE("Failed to unmount secure area on %s (%s)", getMountpoint(), strerror(errno));
goto out_mounted;
}
/* Now that the fuse daemon is dead, unmount it */
if (doUnmount(getFuseMountpoint(), force) != 0) {
SLOGE("Failed to unmount %s (%s)", getFuseMountpoint(), strerror(errno));
goto fail_remount_secure;
}
/* Unmount the real sd card */
if (doUnmount(getMountpoint(), force) != 0) {
SLOGE("Failed to unmount %s (%s)", getMountpoint(), strerror(errno));
goto fail_remount_secure;
}
SLOGI("%s unmounted successfully", getMountpoint());
/* If this is an encrypted volume, and we've been asked to undo
* the crypto mapping, then revert the dm-crypt mapping, and revert
* the device info to the original values.
*/
if (revert && isDecrypted()) {
cryptfs_revert_volume(getLabel());
revertDeviceInfo();
SLOGI("Encrypted volume %s reverted successfully", getMountpoint());
}
setUuid(NULL);
setUserLabel(NULL);
setState(Volume::State_Idle);
mCurrentlyMountedKdev = -1;
return 0;
fail_remount_secure:
if (providesAsec && mountAsecExternal() != 0) {
SLOGE("Failed to remount secure area (%s)", strerror(errno));
goto out_nomedia;
}
out_mounted:
setState(Volume::State_Mounted);
return -1;
out_nomedia:
setState(Volume::State_NoMedia);
return -1;
}
int Volume::initializeMbr(const char *deviceNode) {
struct disk_info dinfo;
memset(&dinfo, 0, sizeof(dinfo));
if (!(dinfo.part_lst = (struct part_info *) malloc(MAX_NUM_PARTS * sizeof(struct part_info)))) {
SLOGE("Failed to malloc prt_lst");
return -1;
}
memset(dinfo.part_lst, 0, MAX_NUM_PARTS * sizeof(struct part_info));
dinfo.device = strdup(deviceNode);
dinfo.scheme = PART_SCHEME_MBR;
dinfo.sect_size = 512;
dinfo.skip_lba = 2048;
dinfo.num_lba = 0;
dinfo.num_parts = 1;
struct part_info *pinfo = &dinfo.part_lst[0];
pinfo->name = strdup("android_sdcard");
pinfo->flags |= PART_ACTIVE_FLAG;
pinfo->type = PC_PART_TYPE_FAT32;
pinfo->len_kb = -1;
int rc = apply_disk_config(&dinfo, 0);
if (rc) {
SLOGE("Failed to apply disk configuration (%d)", rc);
goto out;
}
out:
free(pinfo->name);
free(dinfo.device);
free(dinfo.part_lst);
return rc;
}
/*
* Use blkid to extract UUID and label from device, since it handles many
* obscure edge cases around partition types and formats. Always broadcasts
* updated metadata values.
*/
int Volume::extractMetadata(const char* devicePath) {
int res = 0;
std::string cmd;
cmd = BLKID_PATH;
cmd += " -c /dev/null ";
cmd += devicePath;
FILE* fp = popen(cmd.c_str(), "r");
if (!fp) {
ALOGE("Failed to run %s: %s", cmd.c_str(), strerror(errno));
res = -1;
goto done;
}
char line[1024];
char value[128];
if (fgets(line, sizeof(line), fp) != NULL) {
ALOGD("blkid identified as %s", line);
char* start = strstr(line, "UUID=");
if (start != NULL && sscanf(start + 5, "\"%127[^\"]\"", value) == 1) {
setUuid(value);
} else {
setUuid(NULL);
}
start = strstr(line, "LABEL=");
if (start != NULL && sscanf(start + 6, "\"%127[^\"]\"", value) == 1) {
setUserLabel(value);
} else {
setUserLabel(NULL);
}
} else {
ALOGW("blkid failed to identify %s", devicePath);
res = -1;
}
pclose(fp);
done:
if (res == -1) {
setUuid(NULL);
setUserLabel(NULL);
}
return res;
}