| /* |
| * 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 |