asp 取得用户真实IP，对代理地址仍然有效的函数

<% 
'****************************** 
'函数：GetUserTrueIP() 
'参数：无 
'作者：阿里西西 
'日期：2007/7/13 
'描述：取得用户真实IP，对代理地址仍然有效；返回值：文本类型的IP地址 
'示例：<%=GetUserTrueIP()%> 
'****************************** 
Function GetUserTrueIP() 
  dim strIPAddr 
  If Request.ServerVariables("HTTP_X_FORWARDED_FOR") = "" OR InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), "unknown") > 0 Then 
   strIPAddr = Request.ServerVariables("REMOTE_ADDR") 
  ElseIf InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ",") > 0 Then 
   strIPAddr = Mid(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), 1, InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ",")-1) 
  ElseIf InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ";") > 0 Then 
   strIPAddr = Mid(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), 1, InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ";")-1) 
  Else 
   strIPAddr = Request.ServerVariables("HTTP_X_FORWARDED_FOR") 
  End If 
  GetUserTrueIP = Trim(Mid(strIPAddr, 1, 30)) 
End Function 
%>

<%
Private Function getIP()
Dim strIPAddr
If Request.ServerVariables("HTTP_X_FORWARDED_FOR") = "" OR InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), "unknown") > 0 Then
strIPAddr = Request.ServerVariables("REMOTE_ADDR")
ElseIf InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ",") > 0 Then
strIPAddr = Mid(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), 1, InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ",")-1)
ElseIf InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ";") > 0 Then
strIPAddr = Mid(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), 1, InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ";")-1)
Else
strIPAddr = Request.ServerVariables("HTTP_X_FORWARDED_FOR")
End If
getIP = Trim(Mid(strIPAddr, 1, 30))
End Function
ip=getIP()
response.write(ip)
%>

Function GetReallyIP()

	Dim strIP
	strIP=Request.ServerVariables("HTTP_X_FORWARDED_FOR")
	If strIP="" Or InStr(strIP,"unknown") Then
		strIP=Request.ServerVariables("REMOTE_ADDR")
	ElseIf InStr(strIP,",") Then
		strIP=Split(strIP,",")(0)
	ElseIf InStr(strIP,";") Then
		strIP=Split(strIP,";")(0)
	End If
	
	GetReallyIP=Trim(strIP)

End Function