推薦的用Asp實現屏蔽IP地址訪問的代碼

By zkxp 2/15/2006 http://zkxp.cnblogs.com
‘受屏蔽IP地址(段)集合，星號為萬用字元，通常儲存於設定檔中。
<%
Const BadIPGroup = "220.200.59.136|220.205.168.141"
If IsForbidIP(BadIPGroup) = True Then
Response.Write(GetUserIP &"IP地址禁止訪問")
Response.End()
End If

'****************************************************************
'參數vBadIP：要屏蔽的IP段,IP地址集合，用|符號分隔多個IP地址(段)
'返回Bool：True使用者IP在被屏蔽範圍，False 反之
'****************************************************************
Function IsForbidIP(vBadIP)
Dim counter, arrIPPart, arrBadIP, arrBadIPPart, i, j

arrBadIP = Split(vBadIP, "|")
arrIPPart = Split(GetUserIP(), ".")

For i = 0 To UBound(arrBadIP)
counter = 0
arrBadIPPart = Split(arrBadIP(i), ".")
For j = 0 To UBound(arrIPPart)
If (arrBadIPPart(j)) = "*" or Cstr(arrIPPart(j)) = Cstr(arrBadIPPart(j)) Then
counter = counter + 1
End If
Next
If counter = 4 Then
IsForbidIP = True
Exit Function
End If
Next
IsForbidIP = False
End Function

'***************
'返回客戶IP地址
'***************
Function GetUserIP()
Dim IP
IP = Request.ServerVariables("HTTP_X_FORWARDED_FOR")
If IP = "" Then IP = Request.ServerVariables("REMOTE_ADDR")
GetUserIP = IP
End Function
%>