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/*
* Copyright 2013 Canonical Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 3.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authors:
* Charles Kerr <charles.kerr@canonical.com>
*/
/**
* Monitors whether or not bluetooth is blocked,
* either by software (e.g., a session configuration setting)
* or by hardware (e.g., user disabled it via a physical switch on her laptop).
*
* KillSwitchBluetooth uses this as the impl for its Bluetooth.blocked property
*/
public interface KillSwitch: Object
{
public abstract bool blocked { get; protected set; }
/* Try to block/unblock bluetooth.
* This can fail if the requested state is overruled by a hardware block. */
public abstract void try_set_blocked (bool blocked);
}
/**
* KillSwitch impementation for Linux using /dev/rfkill
*/
public class RfKillSwitch: KillSwitch, Object
{
public bool blocked { get; protected set; default = false; }
public void try_set_blocked (bool blocked)
{
return_if_fail (this.blocked != blocked);
// Try to soft-block all the bluetooth devices
var event = Linux.RfKillEvent() {
op = Linux.RfKillOp.CHANGE_ALL,
type = Linux.RfKillType.BLUETOOTH,
soft = (uint8)blocked
};
/* Write this request to rfkill.
* Don't update this object's "blocked" property here --
* We'll get the update when on_channel_event() reads it below */
var bwritten = Posix.write (fd, &event, sizeof(Linux.RfKillEvent));
if (bwritten == -1)
warning (@"Could not write rfkill event: $(strerror(errno))");
}
/* represents an entry that we've read from the rfkill file */
private class Entry
{
public uint32 idx;
public Linux.RfKillType type;
public bool soft;
public bool hard;
}
private HashTable<uint32,Entry> entries;
private int fd = -1;
private IOChannel channel;
private uint watch;
protected override void dispose ()
{
if (watch != 0)
{
Source.remove (watch);
watch = 0;
}
if (fd != -1)
{
Posix.close (fd);
fd = -1;
}
base.dispose ();
}
public RfKillSwitch ()
{
entries = new HashTable<uint32,Entry>(direct_hash, direct_equal);
var path = "/dev/rfkill";
fd = Posix.open (path, Posix.O_RDWR | Posix.O_NONBLOCK );
if (fd == -1)
{
warning (@"Can't open $path for use as a killswitch backend: $(strerror(errno))");
}
else
{
// read everything that's already there, then watch for more
while (read_event());
channel = new IOChannel.unix_new (fd);
watch = channel.add_watch (IOCondition.IN, on_channel_event);
}
}
private bool on_channel_event (IOChannel source, IOCondition condition)
{
read_event ();
return true;
}
private bool read_event ()
{
assert (fd != -1);
var event = Linux.RfKillEvent();
var n = sizeof (Linux.RfKillEvent);
var bytesread = Posix.read (fd, &event, n);
if (bytesread == n)
{
process_event (event);
return true;
}
return false;
}
private void process_event (Linux.RfKillEvent event)
{
// we only want things that affect bluetooth
if ((event.type != Linux.RfKillType.ALL) &&
(event.type != Linux.RfKillType.BLUETOOTH))
return;
switch (event.op)
{
case Linux.RfKillOp.CHANGE:
case Linux.RfKillOp.ADD:
Entry entry = new Entry ();
entry.idx = event.idx;
entry.type = event.type;
entry.soft = event.soft != 0;
entry.hard = event.hard != 0;
entries.insert (entry.idx, entry);
break;
case Linux.RfKillOp.DEL:
entries.remove (event.idx);
break;
}
/* update our blocked property.
it should be true if any bluetooth entry is hard- or soft-blocked */
var b = false;
foreach (var entry in entries.get_values ())
if ((b = (entry.soft || entry.hard)))
break;
blocked = b;
}
}
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