cocos-enhance-kit/cocos2d-x/cocos/platform/ios/CCReachability.cpp

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

 http://www.cocos2d-x.org

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 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 THE SOFTWARE.
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#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