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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include <stdlib.h>
     18 #include <errno.h>
     19 #include <fcntl.h>
     20 #include <string.h>
     21 
     22 #include <sys/socket.h>
     23 #include <sys/stat.h>
     24 #include <sys/types.h>
     25 #include <sys/wait.h>
     26 
     27 #include <netinet/in.h>
     28 #include <arpa/inet.h>
     29 
     30 #ifdef HAVE_BLUETOOTH
     31 #include <bluedroid/bluetooth.h>
     32 #endif
     33 
     34 #define LOG_TAG "PanController"
     35 #include <cutils/log.h>
     36 
     37 #include "PanController.h"
     38 
     39 #ifdef HAVE_BLUETOOTH
     40 extern "C" int bt_is_enabled();
     41 #endif
     42 
     43 PanController::PanController() {
     44     mPid = 0;
     45 }
     46 
     47 PanController::~PanController() {
     48 }
     49 
     50 int PanController::startPan() {
     51     pid_t pid;
     52 
     53 #ifdef HAVE_BLUETOOTH
     54     if (!bt_is_enabled()) {
     55         ALOGE("Cannot start PAN services - Bluetooth not running");
     56         errno = ENODEV;
     57         return -1;
     58     }
     59 #else
     60     ALOGE("Cannot start PAN services - No Bluetooth support");
     61     errno = ENODEV;
     62     return -1;
     63 #endif
     64 
     65     if (mPid) {
     66         ALOGE("PAN already started");
     67         errno = EBUSY;
     68         return -1;
     69     }
     70 
     71    if ((pid = fork()) < 0) {
     72         ALOGE("fork failed (%s)", strerror(errno));
     73         return -1;
     74     }
     75 
     76     if (!pid) {
     77         if (execl("/system/bin/pand", "/system/bin/pand", "--nodetach", "--listen",
     78                   "--role", "NAP", (char *) NULL)) {
     79             ALOGE("execl failed (%s)", strerror(errno));
     80         }
     81         ALOGE("Should never get here!");
     82         return 0;
     83     } else {
     84         mPid = pid;
     85     }
     86     return 0;
     87 
     88 }
     89 
     90 int PanController::stopPan() {
     91     if (mPid == 0) {
     92         ALOGE("PAN already stopped");
     93         return 0;
     94     }
     95 
     96     ALOGD("Stopping PAN services");
     97     kill(mPid, SIGTERM);
     98     waitpid(mPid, NULL, 0);
     99     mPid = 0;
    100     ALOGD("PAN services stopped");
    101     return 0;
    102 }
    103 
    104 bool PanController::isPanStarted() {
    105     return (mPid != 0 ? true : false);
    106 }
    107