public double variance = 0; //其内部的方差
#endregion Fields
#region Constructors
public MODEventTrustResult(int node, int reportNodeId, string pkgIdent, MODEventCategoryType category, DSClass ds)
{
this.nodeId = node;
this.reportNodeId = Global.getInstance().readers[reportNodeId].Id;
this.ds = ds;
this.eventIdent = pkgIdent;
//TODO app
confirmBeliefThrehold = new Dictionary<MODEventType, double>();
confirmBeliefThrehold[MODEventType.DropPacketMaliciously] = 0.3;
this.timeStamp = Scheduler.getInstance().currentTime;
}
public MODEventTrustCategoryResult(int node, int app, MODEventCategoryType category, DSClass ds)
{
this.node = node;
this.ds = ds;
this.category = category;
this.categoryIdent = node + "-" + category;
this.app = app;
this.confirmedEventNums = new int[(int)MODEventType.COUNT];
//TODO app
}
//如果本节点是其邻居，那么判断没有收到所有数据包的情况
public static MODEventTrustResult NotObservedEventTrustResult(int suspectedNode, int reportNode, string pkgIdent,
MODEventCategoryType category, double[] speeds, bool[] isNeighbors)
{
//可能存在其他误差，设一个较小的值
double b0 = 0.002, b1 = 0.002, b2 = 0.002, b3 = 0.002;
if (!isNeighbors[0] && !isNeighbors[1])
{
b0 = b1 = b2 = b3 = 0.1;
}
else if (isNeighbors[0] && !isNeighbors[1])//prev是nb，sus不是nb
{
b0 = b1 = b2 = b3 = 0.1;
if (speeds[0] > 4) //与速度有关
{
b1 = Math.Min(0.3 * speeds[0] / baseSpeed, 0.6);
b3 = Math.Min(0.3 * speeds[0] / baseSpeed, 0.6);
}
}
else if (!isNeighbors[0] && isNeighbors[1])//prev不是nb，sus是nb
{
b0 = b1 = b2 = b3 = 0.1;
if (speeds[0] + speeds[2] > 4) //与速度有关
{
b1 = Math.Min(0.3 * (speeds[0] + speeds[2]) / baseSpeed, 0.6);
b3 = Math.Min(0.3 * (speeds[0] + speeds[2]) / baseSpeed, 0.6);
}
}
else//均为邻居
{
b0 = b1 = b2 = b3 = 0.1;
if (speeds[0] + speeds[1] + speeds[2] > 4)
{ //与速度有关
b1 = Math.Min(0.3 * (speeds[0] + speeds[1] + speeds[2]) / baseSpeed, 0.6);
b3 = Math.Min(0.3 * (speeds[0] + speeds[1] + speeds[2]) / baseSpeed, 0.6);
}
}
double total = b0 + b1 + b2 + b3 + 0.3;
b0 = b0 / total;
b1 = b1 / total;
b2 = b2 / total;
b3 = b3 / total;
DSClass ds = new DSClass(pow(MODDropPacketEventType.END));
ds.SetM(pow(MODDropPacketEventType.NotDropPacket), b0);
ds.SetM(pow(MODDropPacketEventType.NotDropPacketButNotReceivePacket), b1);
ds.SetM(pow(MODDropPacketEventType.DropPacketDueToBandwith), b2);
ds.SetM(pow(MODDropPacketEventType.DropPacketMaliciously), b3);
ds.SetM(pow(MODDropPacketEventType.END) - 1, 1 - b0 - b1 - b2 - b3);
ds.Cal();
MODEventTrustResult r = new MODEventTrustResult(suspectedNode, reportNode, pkgIdent, category, ds);
if (ds.b[pow(MODEventType.NotDropPacket) + pow(MODEventType.NotDropPacketButNotReceivePacket)] < global.NormalBelief
&& ds.p[pow(MODEventType.NotDropPacket) + pow(MODEventType.NotDropPacketButNotReceivePacket)] < global.NormalPlausibility)//确实是攻击,恶意事件的信念大于正常事件，或恶意事件的信念大于某一个阈值
{
r.supportDroppingMalicious = 1;
}
else
r.supportDroppingMalicious = -1;
return r;
}
public static MODEventTrustResult MergeMaliciousEventTrustResult(int node, Node reportNode, List<MODEventTrustResult> reports,
string pkgIdent, MODEventCategoryType category)
{
double b0 = 0.0;
double b1 = 0.0;
double b2 = 0.0;
double b3 = 0.0;
//各个b的方差
double x0 = 0, x1 = 0, x2 = 0, x3 = 0;
DSClass ds = new DSClass(pow(MODDropPacketEventType.END));
//TODO，确认下面是否是正确的
for (int i = 0; i < reports.Count; i++)
{
b0 += reports[i].ds.b[pow(MODDropPacketEventType.NotDropPacket)];
b1 += reports[i].ds.b[pow(MODDropPacketEventType.NotDropPacketButNotReceivePacket)];
b2 += reports[i].ds.b[pow(MODDropPacketEventType.DropPacketDueToBandwith)];
b3 += reports[i].ds.b[pow(MODDropPacketEventType.DropPacketMaliciously)];
}
b0 = b0 / reports.Count;
b1 = b1 / reports.Count;
b2 = b2 / reports.Count;
b3 = b3 / reports.Count;
ds.SetM(pow(MODDropPacketEventType.NotDropPacket), b0);
ds.SetM(pow(MODDropPacketEventType.NotDropPacketButNotReceivePacket), b1);
ds.SetM(pow(MODDropPacketEventType.DropPacketDueToBandwith), b2);
ds.SetM(pow(MODDropPacketEventType.DropPacketMaliciously), b3);
ds.SetM(pow(MODDropPacketEventType.END) - 1, 1 - b0 - b1 - b2 - b3);
ds.Cal();
//计算方差，即一致度
//TODO，确认下面是否是正确的
for (int i = 0; i < reports.Count; i++)
{
x0 += Math.Pow(b0 - reports[i].ds.b[pow(MODDropPacketEventType.NotDropPacket)], 2);
x1 += Math.Pow(b1 - reports[i].ds.b[pow(MODDropPacketEventType.NotDropPacketButNotReceivePacket)], 2);
x2 += Math.Pow(b2 - reports[i].ds.b[pow(MODDropPacketEventType.DropPacketDueToBandwith)], 2);
x3 += Math.Pow(b3 - reports[i].ds.b[pow(MODDropPacketEventType.DropPacketMaliciously)], 2);
}
MODEventTrustResult result = new MODEventTrustResult(node, reportNode, pkgIdent, category, ds);
result.variance = x0 + x1 + x2 + x3;
if (result.ds.b[pow(MODEventType.NotDropPacket) + pow(MODEventType.NotDropPacketButNotReceivePacket)] < global.NormalBelief
&& result.ds.p[pow(MODEventType.NotDropPacket) + pow(MODEventType.NotDropPacketButNotReceivePacket)] < global.NormalPlausibility)//确实是攻击,恶意事件的信念大于正常事件，或恶意事件的信念大于某一个阈值
result.supportDroppingMalicious = 1;
else
result.supportDroppingMalicious = -1;
return result;
}
public static MODEventTrustResult ForgeNormalEventTrustResult(int node, int reportNode, string pkgIdent, MODEventCategoryType category)
{
double b0 = 0.7;
double b1 = 0.1;
double b2 = 0.1;
double b3 = 0.1;
DSClass ds = new DSClass(pow(MODDropPacketEventType.END));
ds.SetM(pow(MODDropPacketEventType.NotDropPacket), b0);
ds.SetM(pow(MODDropPacketEventType.NotDropPacketButNotReceivePacket), b1);
ds.SetM(pow(MODDropPacketEventType.DropPacketDueToBandwith), b2);
ds.SetM(pow(MODDropPacketEventType.DropPacketMaliciously), b3);
ds.SetM(pow(MODDropPacketEventType.END) - 1, 1 - b0 - b1 - b2 - b3);
ds.Cal();
MODEventTrustResult result = new MODEventTrustResult(node, reportNode, pkgIdent, category, ds);
result.supportDroppingMalicious = -1;
return result;
}
public static int GetStartTypeByCategory(MODEventCategoryType category)
{
switch (category)
{
case MODEventCategoryType.DropPacket:
return (int)MODEventType.NotDropPacket;
//TODO others
default:
return -1;
}
}
public static int GetOffsetByCategory(MODEventCategoryType category, MODEventType type)
{
switch (category)
{
case MODEventCategoryType.DropPacket:
return (int)type - (int)MODDropPacketEventType.NotDropPacket;
//TODO others
default:
return -1;
}
}
