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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 
     21 #include <sys/socket.h>
     22 #include <sys/stat.h>
     23 #include <sys/types.h>
     24 #include <sys/wait.h>
     25 
     26 #include <netinet/in.h>
     27 #include <arpa/inet.h>
     28 
     29 #include <bluedroid/bluetooth.h>
     30 
     31 #define LOG_TAG "PanController"
     32 #include <cutils/log.h>
     33 
     34 #include "PanController.h"
     35 
     36 #ifdef HAVE_BLUETOOTH
     37 extern "C" int bt_is_enabled();
     38 #endif
     39 
     40 PanController::PanController() {
     41     mPid = 0;
     42 }
     43 
     44 PanController::~PanController() {
     45 }
     46 
     47 int PanController::startPan() {
     48     pid_t pid;
     49 
     50 #ifdef HAVE_BLUETOOTH
     51     if (!bt_is_enabled()) {
     52         LOGE("Cannot start PAN services - Bluetooth not running");
     53         errno = ENODEV;
     54         return -1;
     55     }
     56 #else
     57     LOGE("Cannot start PAN services - No Bluetooth support");
     58     errno = ENODEV;
     59     return -1;
     60 #endif
     61 
     62     if (mPid) {
     63         LOGE("PAN already started");
     64         errno = EBUSY;
     65         return -1;
     66     }
     67 
     68    if ((pid = fork()) < 0) {
     69         LOGE("fork failed (%s)", strerror(errno));
     70         return -1;
     71     }
     72 
     73     if (!pid) {
     74         if (execl("/system/bin/pand", "/system/bin/pand", "--nodetach", "--listen",
     75                   "--role", "NAP", (char *) NULL)) {
     76             LOGE("execl failed (%s)", strerror(errno));
     77         }
     78         LOGE("Should never get here!");
     79         return 0;
     80     } else {
     81         mPid = pid;
     82     }
     83     return 0;
     84 
     85 }
     86 
     87 int PanController::stopPan() {
     88     if (mPid == 0) {
     89         LOGE("PAN already stopped");
     90         return 0;
     91     }
     92 
     93     LOGD("Stopping PAN services");
     94     kill(mPid, SIGTERM);
     95     waitpid(mPid, NULL, 0);
     96     mPid = 0;
     97     LOGD("PAN services stopped");
     98     return 0;
     99 }
    100 
    101 bool PanController::isPanStarted() {
    102     return (mPid != 0 ? true : false);
    103 }
    104