使用VB在WIN2000下截获IP数据包(2)

Type IPHeader
lenver As Byte
tos As Byte
len As Integer
ident As Integer
flags As Integer
ttl As Byte
proto As Byte
checksum As Integer
sourceIP As Long
destIP As Long
End Type

Const AF_INET = 2
Const SOCK_RAW = 3
Const IPPROTO_IP = 0
Const IPPROTO_TCP = 6
Const IPPROTO_UDP = 17
Const MAX_PACK_LEN = 65535
Const SOCKET_ERROR = -1&

Private mwsaData As WSA_DATA
Private m_hSocket As Long

Private msaLocalAddr As SOCK_ADDR

Private msaRemoteAddr As SOCK_ADDR

Sub Main()
Dim nResult As Long

nResult = WSAStartup(&H202, mwsaData)
If nResult <> WSANOERROR Then
MsgBox "Error en WSAStartup"
Exit Sub
End If

m_hSocket = socket(AF_INET, SOCK_RAW, IPPROTO_IP)
If (m_hSocket = INVALID_SOCKET) Then
MsgBox "Error in socket"
Exit Sub
End If

msaLocalAddr.sin_family = AF_INET
msaLocalAddr.sin_port = 0
msaLocalAddr.sin_addr.S_addr = inet_addr("192.168.1.125") '这里需要你自己的网卡的IP地址

nResult = bind(m_hSocket, msaLocalAddr, Len(msaLocalAddr))
If (nResult = SOCKET_ERROR) Then
MsgBox "Error in bind"
Exit Sub
End If

Dim InParamBuffer As Long
Dim BytesRet As Long
BytesRet = 0
InParamBuffer = 1

nResult = ioctlsocket(m_hSocket, &H98000001, 1)