unsafe public override void Receive(byte[] buf, int len)
{
long ip_srcaddr = 10, ip_destaddr = 10, header_len = 0;
string out_string = "";
int protocol;
short src_port = 0, dst_port = 0;
IPAddress tmp_ip;
string from_ip, to_ip;
fixed(byte *fixed_buf = buf)
{
IpHeader *header = (IpHeader *)fixed_buf;
header_len = (header->ip_verlen & 0x0F) << 2;
protocol = header->ip_protocol;
ip_srcaddr = header->ip_srcaddr;
ip_destaddr = header->ip_destaddr;
tmp_ip = new IPAddress(ip_srcaddr);
from_ip = tmp_ip.ToString();
tmp_ip = new IPAddress(ip_destaddr);
to_ip = tmp_ip.ToString();
tmp_ip = null;
switch (protocol)
{
case 1: out_string = "ICMP:"; break;
case 2: out_string = "IGMP:"; break;
case 6:
out_string = "TCP:";
src_port = *(short *)&fixed_buf[header_len];
dst_port = *(short *)&fixed_buf[header_len + 2];
from_ip += ":" + IPAddress.NetworkToHostOrder(src_port).ToString();
to_ip += ":" + IPAddress.NetworkToHostOrder(dst_port).ToString();
break;
case 17: out_string = "UDP:";
src_port = *(short *)&fixed_buf[header_len];
dst_port = *(short *)&fixed_buf[header_len + 2];
from_ip += ":" + IPAddress.NetworkToHostOrder(src_port).ToString();
to_ip += ":" + IPAddress.NetworkToHostOrder(dst_port).ToString();
break;
default: out_string = "UNKNOWN"; break;
}
}
out_string += from_ip + "--->" + to_ip.ToString();
list.Items.Add(out_string);
out_string = "total length: " + len.ToString() + " bytes";
list.Items.Add(out_string);
out_string = "data length: " + (len - header_len).ToString() + " bytes";
list.Items.Add(out_string);
}
//parse packet
unsafe public override void Receive(byte[] buf, int len)
{
try
{
long ip_srcaddr = 10, ip_destaddr = 10, header_len = 0;
string out_string = "";
int protocol;
short src_port = 0, dst_port = 0;
IPAddress tmp_ip;
string from_ip, to_ip;
fixed(byte *fixed_buf = buf)
{
IpHeader *header = (IpHeader *)fixed_buf;
header_len = (header->ip_verlen & 0x0F) << 2;
protocol = header->ip_protocol;
ip_srcaddr = header->ip_srcaddr;
ip_destaddr = header->ip_destaddr;
try
{
tmp_ip = new IPAddress(ip_srcaddr);
from_ip = tmp_ip.ToString();
}
catch
{
from_ip = "";
}
try
{
tmp_ip = new IPAddress(ip_destaddr);
to_ip = tmp_ip.ToString();
}
catch
{
to_ip = "";
}
tmp_ip = null;
switch (protocol)
{
case 1: out_string = "ICMP:"; break;
case 2: out_string = "IGMP:"; break;
case 6:
out_string = "TCP:";
src_port = *(short *)&fixed_buf[header_len];
dst_port = *(short *)&fixed_buf[header_len + 2];
from_ip += ":" + IPAddress.NetworkToHostOrder(src_port).ToString();
to_ip += ":" + IPAddress.NetworkToHostOrder(dst_port).ToString();
break;
case 17: out_string = "UDP:";
src_port = *(short *)&fixed_buf[header_len];
dst_port = *(short *)&fixed_buf[header_len + 2];
from_ip += ":" + IPAddress.NetworkToHostOrder(src_port).ToString();
to_ip += ":" + IPAddress.NetworkToHostOrder(dst_port).ToString();
break;
default: out_string = "UNKNOWN:"; break;
}
}
if (protocol == 6)
{
out_string += from_ip + "--->" + to_ip.ToString();
if (IPAddress.NetworkToHostOrder(src_port) < 0 || IPAddress.NetworkToHostOrder(dst_port) < 0)
{
out_string += "<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<";
}
//list.Items.Add(out_string);
out_string = "total length: " + len.ToString() + " bytes!" + "data length: " + (len - header_len).ToString() + " bytes!";
//list.Items.Add(out_string);
int ridhead = 71;
if (from_ip == ipSource + ":" + portSource.ToString() && len > ridhead &&
IPAddress.NetworkToHostOrder(dst_port) == portDest)
{
byte[] tmpbyte = new byte[len - ridhead];
for (int i = 0; i < tmpbyte.Length - 2; i++)
{
tmpbyte[i] = buf[ridhead + i];
}
string s = System.Text.Encoding.ASCII.GetString(tmpbyte);
Thread.Sleep(2000);
if (ePlus.GlobalVar.str_Listener == "")
{
ePlus.GlobalVar.str_Listener_Set = s;
}
//ePlus.GlobalVar.stdRichTB.AppendText("listenStart");
//MessageBox.Show(s.Substring(19));
}
}
}
catch (Exception ex)
{
//list.Items.Add(ex.Source + ex.Message);
}
}
