Hi Luiz,
On Friday 17 of January 2014 10:56:36 Luiz Augusto von Dentz wrote:
> Hi Szymon,
>
> On Fri, Jan 17, 2014 at 10:34 AM, Szymon Janc <szymon.janc@xxxxxxxxx> wrote:
> > Hi Marcel,
> >
> > On Tuesday 14 of January 2014 13:20:32 Marcel Holtmann wrote:
> >> Hi Szymon,
> >>
> >> > This file is intended to be included from device init.rc.
> >> > ---
> >> > android/Android.mk | 16 +++++++++++++++-
> >> > android/Makefile.am | 1 +
> >> > android/init.bluetooth.rc | 27 +++++++++++++++++++++++++++
> >> > 3 files changed, 43 insertions(+), 1 deletion(-)
> >> > create mode 100644 android/init.bluetooth.rc
> >> >
> >> > diff --git a/android/Android.mk b/android/Android.mk
> >> > index ae52ab4..f13e703 100644
> >> > --- a/android/Android.mk
> >> > +++ b/android/Android.mk
> >> > @@ -109,7 +109,7 @@ LOCAL_MODULE := bluetooth.default
> >> > LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw
> >> > LOCAL_MODULE_TAGS := optional
> >> > LOCAL_MODULE_CLASS := SHARED_LIBRARIES
> >> > -LOCAL_REQUIRED_MODULES := bluetoothd bluetoothd-snoop
> >> > +LOCAL_REQUIRED_MODULES := bluetoothd bluetoothd-snoop init.bluetooth.rc
> >> >
> >> > include $(BUILD_SHARED_LIBRARY)
> >> >
> >> > @@ -263,3 +263,17 @@ LOCAL_MODULE_TAGS := optional
> >> > LOCAL_MODULE := bluetoothd-snoop
> >> >
> >> > include $(BUILD_EXECUTABLE)
> >> > +
> >> > +#
> >> > +# init.bleutooth.rc
> >> > +#
> >> > +
> >> > +include $(CLEAR_VARS)
> >> > +
> >> > +LOCAL_MODULE := init.bluetooth.rc
> >> > +LOCAL_MODULE_CLASS := ETC
> >> > +LOCAL_SRC_FILES := $(LOCAL_MODULE)
> >> > +LOCAL_MODULE_TAGS := optional
> >> > +LOCAL_MODULE_PATH := $(TARGET_ROOT_OUT)
> >> > +
> >> > +include $(BUILD_PREBUILT)
> >> > diff --git a/android/Makefile.am b/android/Makefile.am
> >> > index 7806f79..b205019 100644
> >> > --- a/android/Makefile.am
> >> > +++ b/android/Makefile.am
> >> > @@ -134,6 +134,7 @@ android_audio_a2dp_default_la_LDFLAGS = $(AM_LDFLAGS) -module -avoid-version \
> >> > endif
> >> >
> >> > EXTRA_DIST += android/Android.mk android/hal-ipc-api.txt android/README \
> >> > + android/init.bluetooth.rc \
> >> > android/pics-gap.txt android/pics-hid.txt \
> >> > android/pics-pan.txt android/pics-did.txt \
> >> > android/pics-opp.txt android/pics-pbap.txt \
> >> > diff --git a/android/init.bluetooth.rc b/android/init.bluetooth.rc
> >> > new file mode 100644
> >> > index 0000000..e2be9e8
> >> > --- /dev/null
> >> > +++ b/android/init.bluetooth.rc
> >> > @@ -0,0 +1,27 @@
> >> > +chown bluetooth bluetooth /data/misc/bluetooth
> >> > +
> >> > +chown bluetooth bluetooth /dev/uhid
> >> > +
> >> > +on property:bluetooth.start=bluetoothd
> >> > + start bluetoothd
> >> > +
> >> > +on property:bluetooth.stop=bluetoothd
> >> > + stop bluetoothd
> >> > +
> >> > +on property:bluetooth.start=bluetoothd-snoop
> >> > + start bluetoothd-snoop
> >> > +
> >> > +on property:bluetooth.stop=bluetoothd-snoop
> >> > + stop bluetoothd-snoop
> >>
> >> I think this is actually racy. The ctl.start and ctl.stop sound like they have special handling inside Android init. If you accidentally set bluetooth.start , then bad things happen.
> >
> > on property:foo=bar is also triggered if foo is already set to bar so I don't
> > see what could happen wrong here.
> >
> >>
> >> So I would propose doing bluetooth.daemon=on/off and bluetooth.snoop=on/off
> >>
> >> We just have to make sure that when bluetoothd or bluetoothd-snoop die unexpectedly that these properties get set back to off.
> >
> > I'm not sure if we are able to set properties back to proper state if service
> > exited in such case (that would trigger loop in init).
> >
> > My idea was to use bluetooth.start/stop to start/stop (actually stop is needed
> > only for bluetoothd-snoop service) service by bluetooth user (sort of "sudo"
> > wrapper) but don't care about values in those props and if one want to use
> > props to track service lifetime then just use init.svc.bluetoothd{-snoop}
> > property.
> >
> >>
> >> > +
> >> > +service bluetoothd /system/bin/logwrapper /system/bin/bluetoothd
> >> > + class main
> >> > + group bluetooth net_admin
> >> > + disabled
> >> > + oneshot
> >> > +
> >> > +service bluetoothd-snoop /system/bin/bluetoothd-snoop
> >> > + class main
> >> > + group bluetooth net_admin
> >> > + disabled
> >> > + oneshot
> >>
> >> Does net_admin include CAP_NET_RAW actually or are we using some sort of patched module for this?
> >
> > I'm not sure, this was probably just copied from <4.2 android. Since we
> > start as root and drop caps I think this can be removed.
>
> Iirc CAP_NET_RAW is not required by mgmt nor any other part of
> bluetoothd for Android make use of raw sockets so it was dropped at
> some point.
As per comment in main.c we need this for bnep ioctl.
--
Best regards,
Szymon Janc
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