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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "wifi_system/supplicant_manager.h"
#include <android-base/logging.h>
#include <cutils/properties.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
// This ugliness is necessary to access internal implementation details
// of the property subsystem.
#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
#include <sys/_system_properties.h>
namespace android {
namespace wifi_system {
namespace {
const char kSupplicantInitProperty[] = "init.svc.wpa_supplicant";
const char kSupplicantServiceName[] = "wpa_supplicant";
} // namespace
bool SupplicantManager::StartSupplicant() {
char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
int count = 200; /* wait at most 20 seconds for completion */
const prop_info* pi;
unsigned serial = 0;
/* Check whether already running */
if (property_get(kSupplicantInitProperty, supp_status, NULL) &&
strcmp(supp_status, "running") == 0) {
return true;
}
/*
* Get a reference to the status property, so we can distinguish
* the case where it goes stopped => running => stopped (i.e.,
* it start up, but fails right away) from the case in which
* it starts in the stopped state and never manages to start
* running at all.
*/
pi = __system_property_find(kSupplicantInitProperty);
if (pi != NULL) {
serial = __system_property_serial(pi);
}
property_set("ctl.start", kSupplicantServiceName);
sched_yield();
while (count-- > 0) {
if (pi == NULL) {
pi = __system_property_find(kSupplicantInitProperty);
}
if (pi != NULL) {
/*
* property serial updated means that init process is scheduled
* after we sched_yield, further property status checking is based on this
*/
if (__system_property_serial(pi) != serial) {
__system_property_read(pi, NULL, supp_status);
if (strcmp(supp_status, "running") == 0) {
return true;
} else if (strcmp(supp_status, "stopped") == 0) {
return false;
}
}
}
usleep(100000);
}
return false;
}
bool SupplicantManager::StopSupplicant() {
char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
int count = 200; /* wait at most 20 seconds for completion */
/* Check whether supplicant already stopped */
if (property_get(kSupplicantInitProperty, supp_status, NULL) &&
strcmp(supp_status, "stopped") == 0) {
return true;
}
property_set("ctl.stop", kSupplicantServiceName);
sched_yield();
while (count-- > 0) {
if (property_get(kSupplicantInitProperty, supp_status, NULL)) {
if (strcmp(supp_status, "stopped") == 0) return true;
}
usleep(100000);
}
LOG(ERROR) << "Failed to stop supplicant";
return false;
}
bool SupplicantManager::IsSupplicantRunning() {
char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
if (property_get(kSupplicantInitProperty, supp_status, NULL)) {
return strcmp(supp_status, "running") == 0;
}
return false; // Failed to read service status from init.
}
} // namespace wifi_system
} // namespace android
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