bool CheckWithFilter(IPHeader ipHdr, TCPHeader tcpHdr, UDPHeader udpHdr)
{
if (m_filter == null)
{
return(true);
}
if (!m_filter.IncludedProtocol(ipHdr.Protocol))
{
return(false);
}
if (m_filter.AddressList.Count > 0)
{
IPAddress remoteAddr1 = null;
IPAddress remoteAddr2 = null;
if (ipHdr.DestinationAddress.Address == m_sniffingIPAddress.Address)
{
remoteAddr1 = ipHdr.SourceAddress;
}
else if (ipHdr.SourceAddress.Address == m_sniffingIPAddress.Address)
{
remoteAddr1 = ipHdr.DestinationAddress;
}
else
{
remoteAddr1 = ipHdr.SourceAddress;
remoteAddr2 = ipHdr.DestinationAddress;
}
if (remoteAddr2 == null)
{
if ((m_filter.AddressExcluded == m_filter.IncludedAddress(remoteAddr1)))
{
return(false);
}
}
else
{
if (!m_filter.AddressExcluded)
{
if (!m_filter.IncludedAddress(remoteAddr1) &&
!m_filter.IncludedAddress(remoteAddr2))
{
return(false);
}
}
else
{
if (m_filter.IncludedAddress(remoteAddr1) ||
m_filter.IncludedAddress(remoteAddr2))
{
return(false);
}
}
}
}
ushort destport = 0;
ushort srcport = 0;
ushort msglen = 0;
if (tcpHdr != null)
{
destport = tcpHdr.DestinationPort;
srcport = tcpHdr.SourcePort;
msglen = tcpHdr.MessageLength;
}
else if (udpHdr != null)
{
destport = udpHdr.DestinationPort;
srcport = udpHdr.SourcePort;
msglen = udpHdr.MessageLength;
}
else
{
return(false);
}
if (m_filter.DataOnly && msglen <= 0)
{
return(false);
}
if (m_filter.Portlist.Count > 0)
{
if (!m_filter.PortExluded)
{
if ((!m_filter.IncludedPort(destport) &&
!m_filter.IncludedPort(srcport))
)
{
return(false);
}
}
else
{
if ((m_filter.IncludedPort(destport) ||
m_filter.IncludedPort(srcport))
)
{
return(false);
}
}
}
return(true);
}