common/android_bluez.c

/*
 *
 *  BlueZ - Bluetooth protocol stack for Linux
 *
 *  Copyright (C) 2004-2009  Marcel Holtmann <marcel@holtmann.org>
 *
 *
 *  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; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include <private/android_filesystem_config.h>
#include <sys/prctl.h>
#include <linux/capability.h>

/* Set UID to bluetooth w/ CAP_NET_RAW, CAP_NET_ADMIN and CAP_NET_BIND_SERVICE
 * (Android's init.rc does not yet support applying linux capabilities) */
void android_set_aid_and_cap() {
	prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0);
	setuid(AID_BLUETOOTH);

	struct __user_cap_header_struct header;
	struct __user_cap_data_struct cap;
	header.version = _LINUX_CAPABILITY_VERSION;
	header.pid = 0;
	cap.effective = cap.permitted = 1 << CAP_NET_RAW |
					1 << CAP_NET_ADMIN |
					1 << CAP_NET_BIND_SERVICE;
	cap.inheritable = 0;
	capset(&header, &cap);
}