使用VB截獲WIN98系列下的IP數據包
因廣大VB愛好者開發捕獲IP數據包的需要，我花了一個下午的工夫，終于把它整里出來了，由于時間關系，以下的數據分析部分寫的不是很詳細。以下代碼在WIN98+VB6.0上測試通過，主函數部分比較簡單，1。打開設備驅動程序，2。綁定網卡，3。設置捕獲數據，4。循環截獲IP包。
由于在WIN98下捕獲IP數據包，必須要使用VXD技術，它不像WIN2000(可以參照前二天寫的，“使用VB捕獲WIN2000下的IP數據包”)，捕獲IP數據包不需要VXD文件，單單只要使用VB就可以了。因為編寫VXD的步驟比較麻煩，在以下的源代碼中，直接使用IPMAN中的VPACKET.VXD這個驅動程序。可以在網上比較容易得到，需要的朋友也可以跟我聯系。以下包含了截獲數據包的所有源代碼，只要把下面的代碼放到一個模塊(.BAS)文件中就可以了，里面信息截獲到以后，并沒有對數據做太多的處理，所有的數據都放在OutBuff數組中，只是簡單的分離出了以太網頭部m_EtherPacketHead，IP包頭部m_IPPacketHead，其中程序中只是簡單的輸出了源IP地址，目的IP地址，需要更進一不分析里面的內容，可以參照別的資料。在這里為了程序盡量的簡單，所以不過多的牽涉。進一步分析的內容可以添加到輸出內容的附近代碼就可以了。
'--------源代碼開始，放到.bas中即可以測試----------
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
Private Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" (ByVal lpFileName As String, ByVal dwDesiredAccess As Long, ByVal dwShareMode As Long, lpSecurityAttributes As Long, ByVal dwCreationDisposition As Long, ByVal dwFlagsAndAttributes As Long, ByVal hTemplateFile As Long) As Long
Private Declare Function CreateEvent Lib "kernel32" Alias "CreateEventA" (ByVal lpEventAttributes As Long, ByVal bManualReset As Long, ByVal bInitialState As Long, ByVal lpName As String) As Long
Private Declare Function WaitForMultipleObjectsEx Lib "kernel32" (ByVal nCount As Long, lpHandles As Long, ByVal bWaitAll As Long, ByVal dwMilliseconds As Long, ByVal bAlertable As Long) As Long
Private Const INFINITE = &HFFFF
Private Const GENERIC_WRITE = &H40000000
Private Const GENERIC_READ = &H80000000
Private Const OPEN_EXISTING = 3
Private Const FILE_ATTRIBUTE_NORMAL = &H80
Private Const FILE_FLAG_OVERLAPPED = &H40000000
Private Const FILE_FLAG_DELETE_ON_CLOSE = &H4000000
Private Const ERROR_IO_INCOMPLETE = 996&
Private Const NDIS_PACKET_TYPE_DIRECTED = &H1
Private Const IOCTL_PROTOCOL_SET_OID = &H80000004
Private Const IOCTL_PROTOCOL_READ = &H80000010
Private Const OID_GEN_CURRENT_PACKET_FILTER = &H1010E
Private Const WAIT_FAILED = -1
Private Type OVERLAPPED
Internal As Long
InternalHigh As Long
offset As Long
OffsetHigh As Long
hEvent As Long
End Type
Type EtherAddr
AddrByte1 As Byte
AddrByte2 As Byte
AddrByte3 As Byte
AddrByte4 As Byte
AddrByte5 As Byte
AddrByte6 As Byte
End Type
Type EtherPacketHead
DestEther As EtherAddr
SourEther As EtherAddr
ServType As Integer
End Type
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