nQueryMessageStats Class Reference

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List of all members.

Public Types
enum	{ MAX = 101 }
Public Member Functions
	nQueryMessageStats (nMachine &machine)
tString	GetIP ()
bool	PrintWarning ()
virtual void	OnDestroy ()
	called when machine gets destroyed
void	Block ()
bool	FloodProtection (REAL timeFactor)
Public Attributes
nMachine &	machine_
double	lastTime_ [MAX]
int	lastTimeIndex_
bool	warned_

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Detailed Description

Definition at line 798 of file nServerInfo.cpp.

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Member Enumeration Documentation

anonymous enum

Enumerator:

MAX

Definition at line 814 of file nServerInfo.cpp.

{ MAX=101 };

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Constructor & Destructor Documentation

nQueryMessageStats::nQueryMessageStats

(

nMachine &

machine

)

[inline]

Definition at line 801 of file nServerInfo.cpp.

References E10, MAX, and tASSERT.

            : nMachineDecorator( machine )
            , machine_( machine )
            , warned_(false)
    {
        tASSERT( MAX > sn_minPingCounts[ sn_minPingCount-1 ] );

        for ( int i = 0; i < MAX; ++i )
            lastTime_[i] = -1E10;

        lastTimeIndex_ = 0;
    }

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Member Function Documentation

tString nQueryMessageStats::GetIP

(

void

)

[inline]

Definition at line 820 of file nServerInfo.cpp.

References tString::Len().

    {
        tString ret = machine_.GetIP();
        if ( ret.Len() < 4 )
            ret = "everyone";

        return ret;
    }

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bool nQueryMessageStats::PrintWarning

(

)

[inline]

Definition at line 830 of file nServerInfo.cpp.

References lastTime, and tSysTimeFloat().

    {
        if ( warned_ )
            return false;

        double time = tSysTimeFloat();
        static double lastTime = time-10;
        if ( time < lastTime + 5 )
            return false;

        warned_ = true;
        return true;
    }

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virtual void nQueryMessageStats::OnDestroy

(

void

)

[inline, virtual]

called when machine gets destroyed

Reimplemented from nMachineDecorator.

Definition at line 844 of file nServerInfo.cpp.

References con.

    {
        if ( warned_ )
            con << "Flood protection ban of " << GetIP() << " removed because machine is discarded.\n";

        delete this;
    }

void nQueryMessageStats::Block

(

)

[inline]

Definition at line 852 of file nServerInfo.cpp.

References con, MAX, and tSysTimeFloat().

Referenced by FloodProtection().

    {
        // block a DOS attacker for a while so he thinks his attack
        // brought the server down
        double time = tSysTimeFloat();

        if ( lastTime_[0] < time )
        {
            for ( int i = 0; i < MAX; ++i )
            {
                lastTime_[i] = time+10;
            }
        }

        if ( PrintWarning() )
        {
            con << "Flood protection bans " << GetIP() << " for sending multiple querty messages with one packet.\n";
        }
    }

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bool nQueryMessageStats::FloodProtection

(

REAL

timeFactor

)

[inline]

Definition at line 873 of file nServerInfo.cpp.

References con, MAX, REAL, and tSysTimeFloat().

Referenced by FloodProtection().

    {
        int i;
        double now = tSysTimeFloat();

        bool protect = false;
        REAL diff = 0;
        int count = 0;

        // go through the different levels
        for ( i = sn_minPingCount-1; i >= 0; --i )
        {
            // this many pings should be tracked
            count = sn_minPingCounts[i];
            diff = now - lastTime_[(lastTimeIndex_ + MAX - count) % MAX];
            REAL tolerance = sn_minPingTimes[i]*timeFactor;
            if ( tolerance > 0 && diff < tolerance )
            {
                protect = true;
                break;
            }
        }

        lastTimeIndex_ = (lastTimeIndex_ + 1) % MAX;
        lastTime_[lastTimeIndex_] = now;

        if ( protect )
        {
            if ( PrintWarning() )
                con << "Flood protection bans " << GetIP() << " after " << count << " pings in " << int((diff)*100)/100.0 << " seconds.\n";

            return true;
        }

        // reset warning flag
        if ( warned_ && now - lastTime_[(lastTimeIndex_ + MAX-2 ) % MAX] > sn_minPingTimes[ sn_minPingCount-1 ] )
        {
            con << "Flood protection ban of " << GetIP() << " removed.\n";
            warned_ = false;
        }

        return false;
    }

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Member Data Documentation

nMachine& nQueryMessageStats::machine_

Definition at line 815 of file nServerInfo.cpp.

double nQueryMessageStats::lastTime_[MAX]

Definition at line 816 of file nServerInfo.cpp.

int nQueryMessageStats::lastTimeIndex_

Definition at line 817 of file nServerInfo.cpp.

bool nQueryMessageStats::warned_

Definition at line 818 of file nServerInfo.cpp.

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The documentation for this class was generated from the following file:

• src/network/nServerInfo.cpp

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