ios_project/proj.ios_mac/cocos2d-x/cocos/platform/ios/CCReachability.cpp

/****************************************************************************
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 http://www.cocos2d-x.org

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
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 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 THE SOFTWARE.
****************************************************************************/

#include "CCReachability.h"
#include "base/ccMacros.h"

#include <SystemConfiguration/SystemConfiguration.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ifaddrs.h>
#include <netdb.h>
#include <sys/socket.h>

namespace {

#define ShouldPrintReachabilityFlags 0

    static void PrintReachabilityFlags(SCNetworkReachabilityFlags flags, const char* comment)
    {
#if ShouldPrintReachabilityFlags

        printf("Reachability Flag Status: %c%c %c%c%c%c%c%c%c %s\n",
#if CC_TARGET_PLATFORM == CC_PLATFORM_IOS
               (flags & kSCNetworkReachabilityFlagsIsWWAN)               ? 'W' : '-',
#else
               '-',
#endif
               (flags & kSCNetworkReachabilityFlagsReachable)            ? 'R' : '-',

               (flags & kSCNetworkReachabilityFlagsTransientConnection)  ? 't' : '-',
               (flags & kSCNetworkReachabilityFlagsConnectionRequired)   ? 'c' : '-',
               (flags & kSCNetworkReachabilityFlagsConnectionOnTraffic)  ? 'C' : '-',
               (flags & kSCNetworkReachabilityFlagsInterventionRequired) ? 'i' : '-',
               (flags & kSCNetworkReachabilityFlagsConnectionOnDemand)   ? 'D' : '-',
               (flags & kSCNetworkReachabilityFlagsIsLocalAddress)       ? 'l' : '-',
               (flags & kSCNetworkReachabilityFlagsIsDirect)             ? 'd' : '-',
               comment
               );
#endif
    }

    cocos2d::Reachability::NetworkStatus getNetworkStatusForFlags(SCNetworkReachabilityFlags flags)
    {
        PrintReachabilityFlags(flags, "networkStatusForFlags");
        if ((flags & kSCNetworkReachabilityFlagsReachable) == 0)
        {
            // The target host is not reachable.
            return cocos2d::Reachability::NetworkStatus::NOT_REACHABLE;
        }

        cocos2d::Reachability::NetworkStatus returnValue = cocos2d::Reachability::NetworkStatus::NOT_REACHABLE;

        if ((flags & kSCNetworkReachabilityFlagsConnectionRequired) == 0)
        {
            /*
             If the target host is reachable and no connection is required then we'll assume (for now) that you're on Wi-Fi...
             */
            returnValue = cocos2d::Reachability::NetworkStatus::REACHABLE_VIA_WIFI;
        }

        if ((((flags & kSCNetworkReachabilityFlagsConnectionOnDemand ) != 0) ||
             (flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) != 0))
        {
            /*
             ... and the connection is on-demand (or on-traffic) if the calling application is using the CFSocketStream or higher APIs...
             */

            if ((flags & kSCNetworkReachabilityFlagsInterventionRequired) == 0)
            {
                /*
                 ... and no [user] intervention is needed...
                 */
                returnValue = cocos2d::Reachability::NetworkStatus::REACHABLE_VIA_WIFI;
            }
        }

#if CC_TARGET_PLATFORM == CC_PLATFORM_IOS
        if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN)
        {
            /*
             ... but WWAN connections are OK if the calling application is using the CFNetwork APIs.
             */
            returnValue = cocos2d::Reachability::NetworkStatus::REACHABLE_VIA_WWAN;
        }
#endif

        return returnValue;
    }
}

NS_CC_BEGIN

Reachability* Reachability::createWithHostName(const std::string& hostName)
{
    Reachability* returnValue = nullptr;
    SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName(nullptr, hostName.c_str());
    if (reachability != nullptr)
    {
        returnValue = new (std::nothrow) Reachability();
        if (returnValue != nullptr)
        {
            returnValue->autorelease();
            returnValue->_reachabilityRef = reachability;
        }
        else {
            CFRelease(reachability);
        }
    }
    return returnValue;
}

Reachability* Reachability::createWithAddress(const struct sockaddr* hostAddress)
{
    SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, hostAddress);

    Reachability* returnValue = nullptr;

    if (reachability != nullptr)
    {
        returnValue = new (std::nothrow) Reachability();
        if (returnValue != nullptr)
        {
            returnValue->autorelease();
            returnValue->_reachabilityRef = reachability;
        }
        else {
            CFRelease(reachability);
        }
    }
    return returnValue;
}

Reachability* Reachability::createForInternetConnection()
{
    struct sockaddr_in zeroAddress;
    bzero(&zeroAddress, sizeof(zeroAddress));
    zeroAddress.sin_len = sizeof(zeroAddress);
    zeroAddress.sin_family = AF_INET;

    return createWithAddress((const struct sockaddr*) &zeroAddress);
}

Reachability::Reachability()
: _callback(nullptr)
, _userData(nullptr)
, _reachabilityRef(nullptr)
{
}

Reachability::~Reachability()
{
    stopNotifier();
    if (_reachabilityRef != nullptr)
    {
        CFRelease(_reachabilityRef);
    }
}

void Reachability::onReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReachabilityFlags flags, void* info)
{
    CCASSERT(info != nullptr, "info was nullptr in onReachabilityCallback");

    cocos2d::Reachability* thiz = reinterpret_cast<cocos2d::Reachability*>(info);
    if (thiz->_callback != nullptr)
    {
        NetworkStatus status = getNetworkStatusForFlags(flags);
        thiz->_callback(thiz, status, thiz->_userData);
    }
}

bool Reachability::startNotifier(const ReachabilityCallback& cb, void* userData)
{
    _callback = cb;
    _userData = userData;

    bool returnValue = false;
    SCNetworkReachabilityContext context = {0, this, nullptr, nullptr, nullptr};

    if (SCNetworkReachabilitySetCallback(_reachabilityRef, onReachabilityCallback, &context))
    {
        if (SCNetworkReachabilityScheduleWithRunLoop(_reachabilityRef, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode))
        {
            returnValue = true;
        }
    }

    return returnValue;
}

void Reachability::stopNotifier()
{
    if (_reachabilityRef != nullptr)
    {
        SCNetworkReachabilityUnscheduleFromRunLoop(_reachabilityRef, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
    }
}

bool Reachability::isConnectionRequired() const
{
    CCASSERT(_reachabilityRef != nullptr, "connectionRequired called with nullptr reachabilityRef");
    SCNetworkReachabilityFlags flags;

    if (SCNetworkReachabilityGetFlags(_reachabilityRef, &flags))
    {
        return (flags & kSCNetworkReachabilityFlagsConnectionRequired);
    }

    return false;
}

Reachability::NetworkStatus Reachability::getCurrentReachabilityStatus() const
{
    CCASSERT(_reachabilityRef != nullptr, "currentNetworkStatus called with nullptr SCNetworkReachabilityRef");
    NetworkStatus returnValue = NetworkStatus::NOT_REACHABLE;
    SCNetworkReachabilityFlags flags;

    if (SCNetworkReachabilityGetFlags(_reachabilityRef, &flags))
    {
        returnValue = getNetworkStatusForFlags(flags);
    }

    return returnValue;
}

NS_CC_END