558 lines
14 KiB
C++
558 lines
14 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/mount.h>
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#include <linux/kdev_t.h>
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#define LOG_TAG "Vold"
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#include <cutils/log.h>
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#include <sysutils/NetlinkEvent.h>
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#include "VolumeManager.h"
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#include "DirectVolume.h"
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#include "ResponseCode.h"
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#include "Loop.h"
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#include "Fat.h"
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VolumeManager *VolumeManager::sInstance = NULL;
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VolumeManager *VolumeManager::Instance() {
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if (!sInstance)
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sInstance = new VolumeManager();
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return sInstance;
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}
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VolumeManager::VolumeManager() {
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mBlockDevices = new BlockDeviceCollection();
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mVolumes = new VolumeCollection();
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mBroadcaster = NULL;
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mUsbMassStorageConnected = false;
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}
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VolumeManager::~VolumeManager() {
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delete mBlockDevices;
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}
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int VolumeManager::start() {
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return 0;
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}
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int VolumeManager::stop() {
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return 0;
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}
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int VolumeManager::addVolume(Volume *v) {
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mVolumes->push_back(v);
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return 0;
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}
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void VolumeManager::notifyUmsConnected(bool connected) {
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char msg[255];
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if (connected) {
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mUsbMassStorageConnected = true;
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} else {
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mUsbMassStorageConnected = false;
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}
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snprintf(msg, sizeof(msg), "Share method ums now %s",
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(connected ? "available" : "unavailable"));
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getBroadcaster()->sendBroadcast(ResponseCode::ShareAvailabilityChange,
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msg, false);
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}
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void VolumeManager::handleSwitchEvent(NetlinkEvent *evt) {
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const char *devpath = evt->findParam("DEVPATH");
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const char *name = evt->findParam("SWITCH_NAME");
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const char *state = evt->findParam("SWITCH_STATE");
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if (!name || !state) {
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LOGW("Switch %s event missing name/state info", devpath);
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return;
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}
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if (!strcmp(name, "usb_mass_storage")) {
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if (!strcmp(state, "online")) {
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notifyUmsConnected(true);
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} else {
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notifyUmsConnected(false);
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}
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} else {
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LOGW("Ignoring unknown switch '%s'", name);
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}
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}
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void VolumeManager::handleBlockEvent(NetlinkEvent *evt) {
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const char *devpath = evt->findParam("DEVPATH");
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/* Lookup a volume to handle this device */
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VolumeCollection::iterator it;
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bool hit = false;
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for (it = mVolumes->begin(); it != mVolumes->end(); ++it) {
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if (!(*it)->handleBlockEvent(evt)) {
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#ifdef NETLINK_DEBUG
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LOGD("Device '%s' event handled by volume %s\n", devpath, (*it)->getLabel());
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#endif
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hit = true;
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break;
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}
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}
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if (!hit) {
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#ifdef NETLINK_DEBUG
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LOGW("No volumes handled block event for '%s'", devpath);
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#endif
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}
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}
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int VolumeManager::listVolumes(SocketClient *cli) {
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VolumeCollection::iterator i;
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for (i = mVolumes->begin(); i != mVolumes->end(); ++i) {
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char *buffer;
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asprintf(&buffer, "%s %s %d",
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(*i)->getLabel(), (*i)->getMountpoint(),
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(*i)->getState());
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cli->sendMsg(ResponseCode::VolumeListResult, buffer, false);
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free(buffer);
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}
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cli->sendMsg(ResponseCode::CommandOkay, "Volumes listed.", false);
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return 0;
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}
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int VolumeManager::formatVolume(const char *label) {
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Volume *v = lookupVolume(label);
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if (!v) {
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errno = ENOENT;
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return -1;
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}
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return v->formatVol();
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}
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int VolumeManager::getAsecMountPath(const char *id, char *buffer, int maxlen) {
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char mountPoint[255];
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snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
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if (!isMountpointMounted(mountPoint)) {
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errno = ENOENT;
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return -1;
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}
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snprintf(buffer, maxlen, "/asec/%s", id);
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return 0;
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}
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int VolumeManager::createAsec(const char *id, int sizeMb,
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const char *fstype, const char *key, int ownerUid) {
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mkdir("/sdcard/android_secure", 0777);
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if (lookupVolume(id)) {
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LOGE("ASEC volume '%s' currently exists", id);
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errno = EADDRINUSE;
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return -1;
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}
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char asecFileName[255];
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snprintf(asecFileName, sizeof(asecFileName),
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"/sdcard/android_secure/%s.asec", id);
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if (!access(asecFileName, F_OK)) {
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LOGE("ASEC file '%s' currently exists - destroy it first! (%s)",
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asecFileName, strerror(errno));
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errno = EADDRINUSE;
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return -1;
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}
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if (Loop::createImageFile(asecFileName, sizeMb)) {
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LOGE("ASEC image file creation failed (%s)", strerror(errno));
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return -1;
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}
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char loopDevice[255];
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if (Loop::getNextAvailable(loopDevice, sizeof(loopDevice))) {
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unlink(asecFileName);
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return -1;
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}
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if (Loop::create(loopDevice, asecFileName)) {
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LOGE("ASEC loop device creation failed (%s)", strerror(errno));
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unlink(asecFileName);
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return -1;
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}
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/* XXX: Start devmapper */
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if (Fat::format(loopDevice)) {
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LOGE("ASEC FAT format failed (%s)", strerror(errno));
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Loop::destroyByDevice(loopDevice);
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unlink(asecFileName);
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return -1;
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}
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char mountPoint[255];
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snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
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if (mkdir(mountPoint, 0777)) {
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LOGE("Mountpoint creation failed (%s)", strerror(errno));
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Loop::destroyByDevice(loopDevice);
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unlink(asecFileName);
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return -1;
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}
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if (Fat::doMount(loopDevice, mountPoint, false, false, ownerUid,
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0, 0007, false)) {
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LOGE("ASEC FAT mount failed (%s)", strerror(errno));
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Loop::destroyByDevice(loopDevice);
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unlink(asecFileName);
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return -1;
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}
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return 0;
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}
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int VolumeManager::finalizeAsec(const char *id) {
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char asecFileName[255];
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char loopDevice[255];
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char mountPoint[255];
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snprintf(asecFileName, sizeof(asecFileName),
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"/sdcard/android_secure/%s.asec", id);
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if (Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) {
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LOGE("Unable to finalize %s (%s)", id, strerror(errno));
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return -1;
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}
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snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
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// XXX:
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if (Fat::doMount(loopDevice, mountPoint, true, true, 0, 0, 0227, false)) {
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LOGE("ASEC finalize mount failed (%s)", strerror(errno));
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return -1;
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}
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LOGD("ASEC %s finalized", id);
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return 0;
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}
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int VolumeManager::destroyAsec(const char *id) {
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char asecFileName[255];
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char mountPoint[255];
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snprintf(asecFileName, sizeof(asecFileName),
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"/sdcard/android_secure/%s.asec", id);
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snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
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if (isMountpointMounted(mountPoint)) {
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int i, rc;
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for (i = 0; i < 10; i++) {
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rc = umount(mountPoint);
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if (!rc) {
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break;
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}
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if (rc && (errno == EINVAL || errno == ENOENT)) {
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rc = 0;
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break;
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}
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LOGW("ASEC %s unmount attempt %d failed (%s)",
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id, i +1, strerror(errno));
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usleep(1000 * 250);
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}
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if (rc) {
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LOGE("Failed to unmount ASEC %s for destroy", id);
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return -1;
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}
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}
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char loopDevice[255];
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if (!Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) {
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Loop::destroyByDevice(loopDevice);
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}
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unlink(asecFileName);
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LOGD("ASEC %s destroyed", id);
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return 0;
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}
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int VolumeManager::mountAsec(const char *id, const char *key, int ownerUid) {
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char asecFileName[255];
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char mountPoint[255];
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snprintf(asecFileName, sizeof(asecFileName),
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"/sdcard/android_secure/%s.asec", id);
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snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
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if (isMountpointMounted(mountPoint)) {
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LOGE("ASEC %s already mounted", id);
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errno = EBUSY;
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return -1;
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}
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char loopDevice[255];
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if (Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) {
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if (Loop::getNextAvailable(loopDevice, sizeof(loopDevice))) {
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LOGE("Unable to find loop device for ASEC mount");
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return -1;
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}
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if (Loop::create(loopDevice, asecFileName)) {
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LOGE("ASEC loop device creation failed (%s)", strerror(errno));
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return -1;
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}
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}
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if (mkdir(mountPoint, 0777)) {
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LOGE("Mountpoint creation failed (%s)", strerror(errno));
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return -1;
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}
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if (Fat::doMount(loopDevice, mountPoint, true, false, ownerUid, 0,
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0227, false)) {
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LOGE("ASEC mount failed (%s)", strerror(errno));
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return -1;
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}
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LOGD("ASEC %s mounted", id);
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return 0;
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}
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int VolumeManager::mountVolume(const char *label) {
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Volume *v = lookupVolume(label);
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if (!v) {
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errno = ENOENT;
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return -1;
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}
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return v->mountVol();
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}
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int VolumeManager::shareAvailable(const char *method, bool *avail) {
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if (strcmp(method, "ums")) {
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errno = ENOSYS;
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return -1;
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}
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if (mUsbMassStorageConnected)
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*avail = true;
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else
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*avail = false;
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return 0;
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}
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int VolumeManager::simulate(const char *cmd, const char *arg) {
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if (!strcmp(cmd, "ums")) {
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if (!strcmp(arg, "connect")) {
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notifyUmsConnected(true);
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} else if (!strcmp(arg, "disconnect")) {
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notifyUmsConnected(false);
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} else {
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errno = EINVAL;
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return -1;
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}
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} else {
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errno = EINVAL;
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return -1;
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}
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return 0;
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}
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int VolumeManager::shareVolume(const char *label, const char *method) {
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Volume *v = lookupVolume(label);
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if (!v) {
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errno = ENOENT;
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return -1;
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}
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/*
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* Eventually, we'll want to support additional share back-ends,
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* some of which may work while the media is mounted. For now,
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* we just support UMS
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*/
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if (strcmp(method, "ums")) {
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errno = ENOSYS;
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return -1;
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}
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if (v->getState() == Volume::State_NoMedia) {
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errno = ENODEV;
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return -1;
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}
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if (v->getState() != Volume::State_Idle) {
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// You need to unmount manually befoe sharing
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errno = EBUSY;
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return -1;
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}
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dev_t d = v->getDiskDevice();
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if ((MAJOR(d) == 0) && (MINOR(d) == 0)) {
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// This volume does not support raw disk access
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errno = EINVAL;
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return -1;
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}
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int fd;
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char nodepath[255];
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snprintf(nodepath,
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sizeof(nodepath), "/dev/block/vold/%d:%d",
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MAJOR(d), MINOR(d));
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if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file",
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O_WRONLY)) < 0) {
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LOGE("Unable to open ums lunfile (%s)", strerror(errno));
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return -1;
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}
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if (write(fd, nodepath, strlen(nodepath)) < 0) {
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LOGE("Unable to write to ums lunfile (%s)", strerror(errno));
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close(fd);
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return -1;
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}
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close(fd);
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v->handleVolumeShared();
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return 0;
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}
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int VolumeManager::unshareVolume(const char *label, const char *method) {
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Volume *v = lookupVolume(label);
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if (!v) {
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errno = ENOENT;
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return -1;
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}
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if (strcmp(method, "ums")) {
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errno = ENOSYS;
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return -1;
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}
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if (v->getState() != Volume::State_Shared) {
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errno = EINVAL;
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return -1;
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}
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dev_t d = v->getDiskDevice();
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int fd;
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char nodepath[255];
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snprintf(nodepath,
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sizeof(nodepath), "/dev/block/vold/%d:%d",
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MAJOR(d), MINOR(d));
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if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file", O_WRONLY)) < 0) {
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LOGE("Unable to open ums lunfile (%s)", strerror(errno));
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return -1;
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}
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char ch = 0;
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if (write(fd, &ch, 1) < 0) {
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LOGE("Unable to write to ums lunfile (%s)", strerror(errno));
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close(fd);
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return -1;
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}
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close(fd);
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v->handleVolumeUnshared();
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return 0;
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}
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int VolumeManager::unmountVolume(const char *label) {
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Volume *v = lookupVolume(label);
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if (!v) {
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errno = ENOENT;
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return -1;
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}
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if (v->getState() == Volume::State_NoMedia) {
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errno = ENODEV;
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return -1;
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}
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if (v->getState() != Volume::State_Mounted) {
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LOGW("Attempt to unmount volume which isn't mounted (%d)\n",
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v->getState());
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errno = EBUSY;
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return -1;
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}
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return v->unmountVol();
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}
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/*
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* Looks up a volume by it's label or mount-point
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*/
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Volume *VolumeManager::lookupVolume(const char *label) {
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VolumeCollection::iterator i;
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for (i = mVolumes->begin(); i != mVolumes->end(); ++i) {
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if (label[0] == '/') {
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if (!strcmp(label, (*i)->getMountpoint()))
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return (*i);
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} else {
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if (!strcmp(label, (*i)->getLabel()))
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return (*i);
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}
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}
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return NULL;
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}
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bool VolumeManager::isMountpointMounted(const char *mp)
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{
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char device[256];
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char mount_path[256];
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char rest[256];
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FILE *fp;
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char line[1024];
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if (!(fp = fopen("/proc/mounts", "r"))) {
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LOGE("Error opening /proc/mounts (%s)", strerror(errno));
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return false;
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}
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while(fgets(line, sizeof(line), fp)) {
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line[strlen(line)-1] = '\0';
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sscanf(line, "%255s %255s %255s\n", device, mount_path, rest);
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if (!strcmp(mount_path, mp)) {
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fclose(fp);
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return true;
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}
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}
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fclose(fp);
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return false;
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}
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