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gecko-dev/dom/system/gonk/AutoMounter.cpp

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <signal.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <linux/types.h>
#include <linux/netlink.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <android/log.h>
#include "AutoMounter.h"
#include "nsVolumeService.h"
#include "AutoMounterSetting.h"
#include "base/message_loop.h"
#include "mozilla/FileUtils.h"
#include "mozilla/Hal.h"
#include "mozilla/StaticPtr.h"
#include "nsAutoPtr.h"
#include "nsMemory.h"
#include "nsString.h"
#include "nsThreadUtils.h"
#include "nsXULAppAPI.h"
#include "OpenFileFinder.h"
#include "Volume.h"
#include "VolumeManager.h"
using namespace mozilla::hal;
/**************************************************************************
*
* The following "switch" files are available for monitoring usb
* connections:
*
* /sys/devices/virtual/switch/usb_connected/state
* /sys/devices/virtual/switch/usb_configuration/state
*
* Under gingerbread, only the usb_configuration seems to be available.
* Starting with honeycomb, usb_connected was also added.
*
* When a cable insertion/removal occurs, then a uevent similar to the
* following will be generted:
*
* change@/devices/virtual/switch/usb_configuration
* ACTION=change
* DEVPATH=/devices/virtual/switch/usb_configuration
* SUBSYSTEM=switch
* SWITCH_NAME=usb_configuration
* SWITCH_STATE=0
* SEQNUM=5038
*
* SWITCH_STATE will be 0 after a removal and 1 after an insertion
*
**************************************************************************/
#define USB_CONFIGURATION_SWITCH_NAME NS_LITERAL_STRING("usb_configuration")
#define GB_SYS_UMS_ENABLE "/sys/devices/virtual/usb_composite/usb_mass_storage/enable"
#define GB_SYS_USB_CONFIGURED "/sys/devices/virtual/switch/usb_configuration/state"
#define ICS_SYS_USB_FUNCTIONS "/sys/devices/virtual/android_usb/android0/functions"
#define ICS_SYS_UMS_DIRECTORY "/sys/devices/virtual/android_usb/android0/f_mass_storage"
#define ICS_SYS_USB_STATE "/sys/devices/virtual/android_usb/android0/state"
#define USE_DEBUG 0
#undef LOG
#define LOG(args...) __android_log_print(ANDROID_LOG_INFO, "AutoMounter", ## args)
#define LOGW(args...) __android_log_print(ANDROID_LOG_WARN, "AutoMounter", ## args)
#define ERR(args...) __android_log_print(ANDROID_LOG_ERROR, "AutoMounter", ## args)
#if USE_DEBUG
#define DBG(args...) __android_log_print(ANDROID_LOG_DEBUG, "AutoMounter" , ## args)
#else
#define DBG(args...)
#endif
namespace mozilla {
namespace system {
class AutoMounter;
static void SetAutoMounterStatus(int32_t aStatus);
/***************************************************************************/
inline const char* SwitchStateStr(const SwitchEvent& aEvent)
{
return aEvent.status() == SWITCH_STATE_ON ? "plugged" : "unplugged";
}
/***************************************************************************/
static bool
IsUsbCablePluggedIn()
{
#if 0
// Use this code when bug 745078 gets fixed (or use whatever the
// appropriate method is)
return GetCurrentSwitchEvent(SWITCH_USB) == SWITCH_STATE_ON;
#else
// Until then, just go read the file directly
if (access(ICS_SYS_USB_STATE, F_OK) == 0) {
char usbState[20];
if (ReadSysFile(ICS_SYS_USB_STATE, usbState, sizeof(usbState))) {
return strcmp(usbState, "CONFIGURED") == 0;
}
ERR("Error reading file '%s': %s", ICS_SYS_USB_STATE, strerror(errno));
return false;
}
bool configured;
if (ReadSysFile(GB_SYS_USB_CONFIGURED, &configured)) {
return configured;
}
ERR("Error reading file '%s': %s", GB_SYS_USB_CONFIGURED, strerror(errno));
return false;
#endif
}
/***************************************************************************/
// The AutoVolumeManagerStateObserver allows the AutoMounter to know when
// the volume manager changes state (i.e. it has finished initialization)
class AutoVolumeManagerStateObserver : public VolumeManager::StateObserver
{
public:
virtual void Notify(const VolumeManager::StateChangedEvent& aEvent);
};
// The AutoVolumeEventObserver allows the AutoMounter to know about card
// insertion and removal, as well as state changes in the volume.
class AutoVolumeEventObserver : public Volume::EventObserver
{
public:
virtual void Notify(Volume * const & aEvent);
};
class AutoMounterResponseCallback : public VolumeResponseCallback
{
public:
AutoMounterResponseCallback()
: mErrorCount(0)
{
}
protected:
virtual void ResponseReceived(const VolumeCommand* aCommand);
private:
const static int kMaxErrorCount = 3; // Max number of errors before we give up
int mErrorCount;
};
/***************************************************************************/
class AutoMounter : public RefCounted<AutoMounter>
{
public:
typedef nsTArray<RefPtr<Volume> > VolumeArray;
AutoMounter()
: mResponseCallback(new AutoMounterResponseCallback),
mMode(AUTOMOUNTER_DISABLE)
{
VolumeManager::RegisterStateObserver(&mVolumeManagerStateObserver);
Volume::RegisterObserver(&mVolumeEventObserver);
VolumeManager::VolumeArray::size_type numVolumes = VolumeManager::NumVolumes();
VolumeManager::VolumeArray::index_type i;
for (i = 0; i < numVolumes; i++) {
RefPtr<Volume> vol = VolumeManager::GetVolume(i);
if (vol) {
vol->RegisterObserver(&mVolumeEventObserver);
// We need to pick up the intial value of the
// ums.volume.NAME.enabled setting.
AutoMounterSetting::CheckVolumeSettings(vol->Name());
}
}
DBG("Calling UpdateState from constructor");
UpdateState();
}
~AutoMounter()
{
VolumeManager::VolumeArray::size_type numVolumes = VolumeManager::NumVolumes();
VolumeManager::VolumeArray::index_type volIndex;
for (volIndex = 0; volIndex < numVolumes; volIndex++) {
RefPtr<Volume> vol = VolumeManager::GetVolume(volIndex);
if (vol) {
vol->UnregisterObserver(&mVolumeEventObserver);
}
}
Volume::UnregisterObserver(&mVolumeEventObserver);
VolumeManager::UnregisterStateObserver(&mVolumeManagerStateObserver);
}
void UpdateState();
const char* ModeStr(int32_t aMode)
{
switch (aMode) {
case AUTOMOUNTER_DISABLE: return "Disable";
case AUTOMOUNTER_ENABLE: return "Enable";
case AUTOMOUNTER_DISABLE_WHEN_UNPLUGGED: return "DisableWhenUnplugged";
}
return "??? Unknown ???";
}
void SetMode(int32_t aMode)
{
if ((aMode == AUTOMOUNTER_DISABLE_WHEN_UNPLUGGED) &&
(mMode == AUTOMOUNTER_DISABLE)) {
// If it's already disabled, then leave it as disabled.
// AUTOMOUNTER_DISABLE_WHEN_UNPLUGGED implies "enabled until unplugged"
aMode = AUTOMOUNTER_DISABLE;
}
if ((aMode == AUTOMOUNTER_DISABLE) &&
(mMode == AUTOMOUNTER_ENABLE) && IsUsbCablePluggedIn()) {
// On many devices (esp non-Samsung), we can't force the disable, so we
// need to defer until the USB cable is actually unplugged.
// See bug 777043.
//
// Otherwise our attempt to disable it will fail, and we'll wind up in a bad
// state where the AutoMounter thinks that Sharing has been turned off, but
// the files are actually still being Shared because the attempt to unshare
// failed.
LOG("Attempting to disable UMS. Deferring until USB cable is unplugged.");
aMode = AUTOMOUNTER_DISABLE_WHEN_UNPLUGGED;
}
if (aMode != mMode) {
LOG("Changing mode from '%s' to '%s'", ModeStr(mMode), ModeStr(aMode));
mMode = aMode;
DBG("Calling UpdateState due to mode set to %d", mMode);
UpdateState();
}
}
void SetSharingMode(const nsACString& aVolumeName, bool aAllowSharing)
{
RefPtr<Volume> vol = VolumeManager::FindVolumeByName(aVolumeName);
if (!vol) {
return;
}
if (vol->IsSharingEnabled() == aAllowSharing) {
return;
}
vol->SetSharingEnabled(aAllowSharing);
DBG("Calling UpdateState due to volume %s shareing set to %d",
vol->NameStr(), (int)aAllowSharing);
UpdateState();
}
private:
AutoVolumeEventObserver mVolumeEventObserver;
AutoVolumeManagerStateObserver mVolumeManagerStateObserver;
RefPtr<VolumeResponseCallback> mResponseCallback;
int32_t mMode;
};
static StaticRefPtr<AutoMounter> sAutoMounter;
/***************************************************************************/
void
AutoVolumeManagerStateObserver::Notify(const VolumeManager::StateChangedEvent &)
{
LOG("VolumeManager state changed event: %s", VolumeManager::StateStr());
if (!sAutoMounter) {
return;
}
DBG("Calling UpdateState due to VolumeManagerStateObserver");
sAutoMounter->UpdateState();
}
void
AutoVolumeEventObserver::Notify(Volume * const &)
{
if (!sAutoMounter) {
return;
}
DBG("Calling UpdateState due to VolumeEventStateObserver");
sAutoMounter->UpdateState();
}
void
AutoMounterResponseCallback::ResponseReceived(const VolumeCommand* aCommand)
{
if (WasSuccessful()) {
DBG("Calling UpdateState due to Volume::OnSuccess");
mErrorCount = 0;
sAutoMounter->UpdateState();
return;
}
ERR("Command '%s' failed: %d '%s'",
aCommand->CmdStr(), ResponseCode(), ResponseStr().get());
if (++mErrorCount < kMaxErrorCount) {
DBG("Calling UpdateState due to VolumeResponseCallback::OnError");
sAutoMounter->UpdateState();
}
}
class AutoBool {
public:
explicit AutoBool(bool &aBool) : mBool(aBool) {
mBool = true;
}
~AutoBool() {
mBool = false;
}
private:
bool &mBool;
};
/***************************************************************************/
void
AutoMounter::UpdateState()
{
static bool inUpdateState = false;
if (inUpdateState) {
// When UpdateState calls SetISharing, this causes a volume state
// change to occur, which would normally cause UpdateState to be called
// again. We want the volume state change to go out (so that device
// storage will see the change in sharing state), but since we're
// already in UpdateState we just want to prevent recursion from screwing
// things up.
return;
}
AutoBool inUpdateStateDetector(inUpdateState);
MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
// If the following preconditions are met:
// - UMS is available (i.e. compiled into the kernel)
// - UMS is enabled
// - AutoMounter is enabled
// - USB cable is plugged in
// then we will try to unmount and share
// otherwise we will try to unshare and mount.
if (VolumeManager::State() != VolumeManager::VOLUMES_READY) {
// The volume manager isn't in a ready state, so there
// isn't anything else that we can do.
LOG("UpdateState: VolumeManager not ready yet");
return;
}
if (mResponseCallback->IsPending()) {
// We only deal with one outstanding volume command at a time,
// so we need to wait for it to finish.
return;
}
bool umsAvail = false;
bool umsEnabled = false;
if (access(ICS_SYS_USB_FUNCTIONS, F_OK) == 0) {
umsAvail = (access(ICS_SYS_UMS_DIRECTORY, F_OK) == 0);
if (umsAvail) {
char functionsStr[60];
if (ReadSysFile(ICS_SYS_USB_FUNCTIONS, functionsStr, sizeof(functionsStr))) {
umsEnabled = strstr(functionsStr, "mass_storage") != nullptr;
} else {
ERR("Error reading file '%s': %s", ICS_SYS_USB_FUNCTIONS, strerror(errno));
umsEnabled = false;
}
} else {
umsEnabled = false;
}
} else {
umsAvail = ReadSysFile(GB_SYS_UMS_ENABLE, &umsEnabled);
}
bool usbCablePluggedIn = IsUsbCablePluggedIn();
bool enabled = (mMode == AUTOMOUNTER_ENABLE);
if (mMode == AUTOMOUNTER_DISABLE_WHEN_UNPLUGGED) {
enabled = usbCablePluggedIn;
if (!usbCablePluggedIn) {
mMode = AUTOMOUNTER_DISABLE;
}
}
bool tryToShare = (umsAvail && umsEnabled && enabled && usbCablePluggedIn);
LOG("UpdateState: umsAvail:%d umsEnabled:%d mode:%d usbCablePluggedIn:%d tryToShare:%d",
umsAvail, umsEnabled, mMode, usbCablePluggedIn, tryToShare);
bool filesOpen = false;
static unsigned filesOpenDelayCount = 0;
VolumeArray::index_type volIndex;
VolumeArray::size_type numVolumes = VolumeManager::NumVolumes();
for (volIndex = 0; volIndex < numVolumes; volIndex++) {
RefPtr<Volume> vol = VolumeManager::GetVolume(volIndex);
Volume::STATE volState = vol->State();
if (vol->State() == nsIVolume::STATE_MOUNTED) {
LOG("UpdateState: Volume %s is %s and %s @ %s gen %d locked %d sharing %c",
vol->NameStr(), vol->StateStr(),
vol->MediaPresent() ? "inserted" : "missing",
vol->MountPoint().get(), vol->MountGeneration(),
(int)vol->IsMountLocked(),
vol->CanBeShared() ? (vol->IsSharingEnabled() ? 'y' : 'n') : 'x');
} else {
LOG("UpdateState: Volume %s is %s and %s", vol->NameStr(), vol->StateStr(),
vol->MediaPresent() ? "inserted" : "missing");
}
if (!vol->MediaPresent()) {
// No media - nothing we can do
continue;
}
if (tryToShare && vol->IsSharingEnabled()) {
// We're going to try to unmount and share the volumes
switch (volState) {
case nsIVolume::STATE_MOUNTED: {
if (vol->IsMountLocked()) {
// The volume is currently locked, so leave it in the mounted
// state.
LOGW("UpdateState: Mounted volume %s is locked, not sharing",
vol->NameStr());
break;
}
// Mark the volume as if we've started sharing. This will cause
// apps which watch device storage notifications to see the volume
// go into the shared state, and prompt them to close any open files
// that they might have.
vol->SetIsSharing(true);
// Check to see if there are any open files on the volume and
// don't initiate the unmount while there are open files.
OpenFileFinder::Info fileInfo;
OpenFileFinder fileFinder(vol->MountPoint());
if (fileFinder.First(&fileInfo)) {
LOGW("The following files are open under '%s'",
vol->MountPoint().get());
do {
LOGW(" PID: %d file: '%s' app: '%s' comm: '%s' exe: '%s'\n",
fileInfo.mPid,
fileInfo.mFileName.get(),
fileInfo.mAppName.get(),
fileInfo.mComm.get(),
fileInfo.mExe.get());
} while (fileFinder.Next(&fileInfo));
LOGW("UpdateState: Mounted volume %s has open files, not sharing",
vol->NameStr());
// Check again in a few seconds to see if the files are closed.
// Since we're trying to share the volume, this implies that we're
// plugged into the PC via USB and this in turn implies that the
// battery is charging, so we don't need to be too concerned about
// wasting battery here.
//
// If we just detected that there were files open, then we use
// a short timer. We will have told the apps that we're trying
// trying to share, and they'll be closing their files. This makes
// the sharing more responsive. If after a few seconds, the apps
// haven't closed their files, then we back off.
int delay = 1000;
if (filesOpenDelayCount > 10) {
delay = 5000;
}
MessageLoopForIO::current()->
PostDelayedTask(FROM_HERE,
NewRunnableMethod(this, &AutoMounter::UpdateState),
delay);
filesOpen = true;
break;
}
// Volume is mounted, we need to unmount before
// we can share.
LOG("UpdateState: Unmounting %s", vol->NameStr());
vol->StartUnmount(mResponseCallback);
return; // UpdateState will be called again when the Unmount command completes
}
case nsIVolume::STATE_IDLE: {
// Volume is unmounted. We can go ahead and share.
LOG("UpdateState: Sharing %s", vol->NameStr());
vol->StartShare(mResponseCallback);
return; // UpdateState will be called again when the Share command completes
}
default: {
// Not in a state that we can do anything about.
break;
}
}
} else {
// We're going to try and unshare and remount the volumes
switch (volState) {
case nsIVolume::STATE_SHARED: {
// Volume is shared. We can go ahead and unshare.
LOG("UpdateState: Unsharing %s", vol->NameStr());
vol->StartUnshare(mResponseCallback);
return; // UpdateState will be called again when the Unshare command completes
}
case nsIVolume::STATE_IDLE: {
// Volume is unmounted, try to mount.
LOG("UpdateState: Mounting %s", vol->NameStr());
vol->StartMount(mResponseCallback);
return; // UpdateState will be called again when Mount command completes
}
default: {
// Not in a state that we can do anything about.
break;
}
}
}
}
int32_t status = AUTOMOUNTER_STATUS_DISABLED;
if (filesOpen) {
filesOpenDelayCount++;
status = AUTOMOUNTER_STATUS_FILES_OPEN;
} else if (enabled) {
filesOpenDelayCount = 0;
status = AUTOMOUNTER_STATUS_ENABLED;
}
SetAutoMounterStatus(status);
}
/***************************************************************************/
static void
InitAutoMounterIOThread()
{
MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
MOZ_ASSERT(!sAutoMounter);
sAutoMounter = new AutoMounter();
}
static void
ShutdownAutoMounterIOThread()
{
MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
sAutoMounter = nullptr;
ShutdownVolumeManager();
}
static void
SetAutoMounterModeIOThread(const int32_t& aMode)
{
MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
MOZ_ASSERT(sAutoMounter);
sAutoMounter->SetMode(aMode);
}
static void
SetAutoMounterSharingModeIOThread(const nsCString& aVolumeName, const bool& aAllowSharing)
{
MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
MOZ_ASSERT(sAutoMounter);
sAutoMounter->SetSharingMode(aVolumeName, aAllowSharing);
}
static void
UsbCableEventIOThread()
{
MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
if (!sAutoMounter) {
return;
}
DBG("Calling UpdateState due to USBCableEvent");
sAutoMounter->UpdateState();
}
/**************************************************************************
*
* Public API
*
* Since the AutoMounter runs in IO Thread context, we need to switch
* to IOThread context before we can do anything.
*
**************************************************************************/
class UsbCableObserver : public SwitchObserver,
public RefCounted<UsbCableObserver>
{
public:
UsbCableObserver()
{
RegisterSwitchObserver(SWITCH_USB, this);
}
~UsbCableObserver()
{
UnregisterSwitchObserver(SWITCH_USB, this);
}
virtual void Notify(const SwitchEvent& aEvent)
{
DBG("UsbCable switch device: %d state: %s\n",
aEvent.device(), SwitchStateStr(aEvent));
XRE_GetIOMessageLoop()->PostTask(
FROM_HERE,
NewRunnableFunction(UsbCableEventIOThread));
}
};
static StaticRefPtr<UsbCableObserver> sUsbCableObserver;
static StaticRefPtr<AutoMounterSetting> sAutoMounterSetting;
static void
InitVolumeConfig()
{
// This function uses /system/etc/volume.cfg to add additional volumes
// to the Volume Manager.
//
// This is useful on devices like the Nexus 4, which have no physical sd card
// or dedicated partition.
//
// The format of the volume.cfg file is as follows:
// create volume-name mount-point
// Blank lines and lines starting with the hash character "#" will be ignored.
nsCOMPtr<nsIVolumeService> vs = do_GetService(NS_VOLUMESERVICE_CONTRACTID);
NS_ENSURE_TRUE_VOID(vs);
ScopedCloseFile fp;
int n = 0;
char line[255];
char *command, *vol_name_cstr, *mount_point_cstr, *save_ptr;
const char *filename = "/system/etc/volume.cfg";
if (!(fp = fopen(filename, "r"))) {
LOG("Unable to open volume configuration file '%s' - ignoring", filename);
return;
}
while(fgets(line, sizeof(line), fp)) {
const char *delim = " \t\n";
n++;
if (line[0] == '#')
continue;
if (!(command = strtok_r(line, delim, &save_ptr))) {
// Blank line - ignore
continue;
}
if (!strcmp(command, "create")) {
if (!(vol_name_cstr = strtok_r(nullptr, delim, &save_ptr))) {
ERR("No vol_name in %s line %d", filename, n);
continue;
}
if (!(mount_point_cstr = strtok_r(nullptr, delim, &save_ptr))) {
ERR("No mount point for volume '%s'. %s line %d", vol_name_cstr, filename, n);
continue;
}
nsString mount_point = NS_ConvertUTF8toUTF16(mount_point_cstr);
nsString vol_name = NS_ConvertUTF8toUTF16(vol_name_cstr);
nsresult rv;
rv = vs->CreateFakeVolume(vol_name, mount_point);
NS_ENSURE_SUCCESS_VOID(rv);
rv = vs->SetFakeVolumeState(vol_name, nsIVolume::STATE_MOUNTED);
NS_ENSURE_SUCCESS_VOID(rv);
}
else {
ERR("Unrecognized command: '%s'", command);
}
}
}
void
InitAutoMounter()
{
InitVolumeConfig();
InitVolumeManager();
sAutoMounterSetting = new AutoMounterSetting();
XRE_GetIOMessageLoop()->PostTask(
FROM_HERE,
NewRunnableFunction(InitAutoMounterIOThread));
// Switch Observers need to run on the main thread, so we need to
// start it here and have it send events to the AutoMounter running
// on the IO Thread.
sUsbCableObserver = new UsbCableObserver();
}
int32_t
GetAutoMounterStatus()
{
if (sAutoMounterSetting) {
return sAutoMounterSetting->GetStatus();
}
return AUTOMOUNTER_STATUS_DISABLED;
}
//static
void
SetAutoMounterStatus(int32_t aStatus)
{
if (sAutoMounterSetting) {
sAutoMounterSetting->SetStatus(aStatus);
}
}
void
SetAutoMounterMode(int32_t aMode)
{
XRE_GetIOMessageLoop()->PostTask(
FROM_HERE,
NewRunnableFunction(SetAutoMounterModeIOThread, aMode));
}
void
SetAutoMounterSharingMode(const nsCString& aVolumeName, bool aAllowSharing)
{
XRE_GetIOMessageLoop()->PostTask(
FROM_HERE,
NewRunnableFunction(SetAutoMounterSharingModeIOThread,
aVolumeName, aAllowSharing));
}
void
ShutdownAutoMounter()
{
sAutoMounterSetting = nullptr;
sUsbCableObserver = nullptr;
XRE_GetIOMessageLoop()->PostTask(
FROM_HERE,
NewRunnableFunction(ShutdownAutoMounterIOThread));
}
} // system
} // mozilla
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