private Byte[] packetize(ICMP icmp)
{
Byte[] buff=new Byte[icmp.body_size+8];
//Type
buff[0]=icmp.type;
//SubCode
buff[1]=icmp.subcode;
//CheckSum
buff[2]=(Byte)(icmp.checkSum>>8);
buff[3]=(Byte)(icmp.checkSum&0xFF);
//ID
buff[4]=(Byte)(icmp.id>>8);
buff[5]=(Byte)(icmp.id&0xFF);
//Sequence
buff[6]=(Byte)(icmp.sq>>8);
buff[7]=(Byte)(icmp.sq&0xFF);
//Data
Array.Copy(icmp.body,0,buff,8,icmp.body_size);
//OID
buff[8]=(Byte)(icmp.oid>>24);
buff[9]=(Byte)(icmp.oid>>16);
buff[10]=(Byte)(icmp.oid>>8);
buff[11]=(Byte)(icmp.oid&0xFF);
//TimeTick
buff[12]=(Byte)(icmp.send_time>>24);
buff[13]=(Byte)(icmp.send_time>>16);
buff[14]=(Byte)(icmp.send_time>>8);
buff[15]=(Byte)(icmp.send_time&0xFF);
return buff;
}
public static ICMP ToICMP(Byte[] rdata){
if(rdata.Length<36) return null;
ICMP icmp=new ICMP();
//deCode
icmp.type=rdata[20];
icmp.subcode=rdata[21];
icmp.checkSum=(UInt16)((rdata[22]<<8)+rdata[23]);
icmp.id=(UInt16)((rdata[24]<<8)+rdata[25]);
icmp.sq=(UInt16)((rdata[26]<<8)+rdata[27]);
icmp.body_size=0;
icmp.body=null;
icmp.oid=(rdata[28]<<24)+(rdata[29]<<16)+(rdata[30]<<8)+rdata[31];
icmp.send_time=(uint)((rdata[32]<<24)+(rdata[33]<<16)
+(rdata[34]<<8)+rdata[35]);
return icmp;
}
public int Send(int lsize){
long send_ticks=0;
Byte[] sbuff;
if(lsize<=8) return -1004;
if(target==null) return -1002;
ICMP icmp=new ICMP(lsize);
icmp.id=pid;
icmp.sq=sq++;
if(icmp.sq>=1000) sq=1;
QueryPerformanceCounter(ref send_ticks);
icmp.send_time=(uint)(send_ticks*1000000.0/freq);//milisec
//Console.Write("SendTime:{0} ",icmp.send_time);
icmp.oid=oid;
sbuff=icmp.ToBuffer();
//
/*
Console.WriteLine("Send:id={0},sq={1},oid={2},send_time={3}",
icmp.id,icmp.sq,icmp.oid,icmp.send_time);
*/
int nBytes=socket.SendTo(sbuff,sbuff.Length,0,target);
if(nBytes!=sbuff.Length){
return -1003;
}
return 0;
}