推荐的用Asp实现屏蔽IP地址访问的代码

答案：By zkxp 2/15/2006 http://zkxp.cnblogs.com 
‘受屏蔽IP地址(段)集合，星号为通配符，通常保存于配置文件中。 
<% 
Const BadIPGroup = "220.200.59.136|220.205.168.141" 
If IsForbidIP(BadIPGroup) = True Then 
    Response.Write(GetUserIP &"IP地址禁止访问") 
    Response.End() 
End If 
'**************************************************************** 
'参数vBadIP：要屏蔽的IP段,IP地址集合，用|符号分隔多个IP地址(段) 
'返回Bool：True用户IP在被屏蔽范围，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 
'*************** 
'返回客户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 
%>

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