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