protected override SocketPacket DoAnalyz(byte[] raw, int startPos, int length)
{
byte temp_protocol = 0;
uint temp_version = 0;
uint temp_ip_srcaddr = 0;
uint temp_ip_destaddr = 0;
short temp_srcport = 0;
short temp_dstport = 0;
IPAddress temp_ip;
SocketPacket retValue = new SocketPacket();
unsafe
{
fixed (byte* fixed_buf = raw)
{
IP4Header_V2* head = (IP4Header_V2*)fixed_buf;//把数据流整和为IPHeader结构
retValue.HeaderLength = (head->ip_verlen & 0x0F) << 2;
temp_protocol = head->ip_protocol;
switch (temp_protocol)//提取协议类型
{
case 1: retValue.ProtocolType = Protocol.ICMP; break;
case 2: retValue.ProtocolType = Protocol.IGMP; break;
case 6: retValue.ProtocolType = Protocol.TCP; break;
case 17: retValue.ProtocolType = Protocol.UDP; break;
default: retValue.ProtocolType = Protocol.Unknown; break;
}
temp_version = (uint)(head->ip_verlen & 0xF0) >> 4;//提取IP协议版本
retValue.Version = temp_version.ToString();
//以下语句提取出了PacketArrivedEventArgs对象中的其他参数
temp_ip_srcaddr = head->ip_srcaddr;
temp_ip_destaddr = head->ip_destaddr;
temp_ip = new IPAddress(temp_ip_srcaddr);
retValue.Source = temp_ip.ToString();
retValue.SourceAddress = temp_ip;
temp_ip = new IPAddress(temp_ip_destaddr);
retValue.Destination = temp_ip.ToString();
retValue.DestinationAddress = temp_ip;
temp_srcport = *(short*)&fixed_buf[retValue.HeaderLength];
temp_dstport = *(short*)&fixed_buf[retValue.HeaderLength + 2];
retValue.SourcePort = IPAddress.NetworkToHostOrder(temp_srcport).ToString();
retValue.DestinationPort = IPAddress.NetworkToHostOrder(temp_dstport).ToString();
retValue.TotalLength = length;
retValue.MessageLength = length - retValue.HeaderLength;
}
}
return retValue;
}
public void PushPackage(SocketPacket package)
{
if (IPAddress.Equals(package.SourceAddress, m_localbindaddress)
|| IPAddress.Equals(package.DestinationAddress, m_localbindaddress)
)//only process the package of local address
{
lock (m_datalist)
{
m_datalist.Add(package);
}
}
}