<%
'盗链判断
Dim server_v1,server_v2
server_v1=Cstr(Request.ServerVariables("HTTP_REFERER"))
server_v2=Cstr(Request.ServerVariables("SERVER_NAME"))
If Mid(server_v1,8,len(server_v2))<>server_v2 Then
Response.Write "非法的盗链"
Response.End
End If
Dim url, body, myCache
url = Request.QueryString("url")
Set myCache = new cache
myCache.name = "picindex"&url
If myCache.valid Then
body = myCache.value
Else
body = GetWebData(url)
myCache.add body,dateadd("d",1,now)
End If
If Err.Number = 0 Then
Response.CharSet = "UTF-8"
Response.ContentType = "application/octet-stream"
Response.BinaryWrite body
Response.Flush
Else
Wscript.Echo Err.Description
End if
'取得数据
Public Function GetWebData(ByVal strUrl)
Dim curlpath
curlpath = Mid(strUrl,1,Instr(8,strUrl,"/"))
Dim Retrieval
Set Retrieval = Server.CreateObject("Microsoft.XMLHTTP")
With Retrieval
.Open "Get", strUrl, False,"",""
.setRequestHeader "Referer", curlpath
.Send
GetWebData =.ResponseBody
End With
Set Retrieval = Nothing
End Function
'cache类
class Cache
private obj 'cache内容
private expireTime '过期时间
private expireTimeName '过期时间application名
private cacheName 'cache内容application名
private path 'url
private sub class_initialize()
path=request.servervariables("url")
path=left(path,instrRev(path,"/"))
end sub
private sub class_terminate()
end sub
public property get blEmpty
'是否为空
if isempty(obj) then
blEmpty=true
else
blEmpty=false
end if
end property
public property get valid
'是否可用(过期)
if isempty(obj) or not isDate(expireTime) then
valid=false
elseif CDate(expireTime)<now then
valid=false
else
valid=true
end if
end property
public property let name(str)
'设置cache名
cacheName=str & path
obj=application(cacheName)
expireTimeName=str & "expires" & path
expireTime=application(expireTimeName)
end property
public property let expires(tm)
'重设置过期时间
expireTime=tm
application.lock
application(expireTimeName)=expireTime
application.unlock
end property
public sub add(var,expire)
'赋值
if isempty(var) or not isDate(expire) then
exit sub
end if
obj=var
expireTime=expire
application.lock
application(cacheName)=obj
application(expireTimeName)=expireTime
application.unlock
end sub
public property get value
'取值
if isempty(obj) or not isDate(expireTime) then
value=null
elseif CDate(expireTime)<now then
value=null
else
value=obj
end if
end property
public sub makeEmpty()
'释放application
application.lock
application(cacheName)=empty
application(expireTimeName)=empty
application.unlock
obj=empty
expireTime=empty
end sub
public function equal(var2)
'比较
if typename(obj)<>typename(var2) then
equal=false
elseif typename(obj)="Object" then
if obj is var2 then
equal=true
else
equal=false
end if
elseif typename(obj)="Variant()" then
if join(obj,"^")=join(var2,"^") then
equal=true
else
equal=false
end if
else
if obj=var2 then
equal=true
else
equal=false
end if
end if
end function
end class
%>
第一种:
终于对下载系统做了个防盗链措施,在下载的页面头部做了如下代码,相关代码如下:
<%
From_url = Cstr(Request.ServerVariables("HTTP_REFERER"))
Serv_url = Cstr(Request.ServerVariables("SERVER_NAME"))
if mid(From_url,8,len(Serv_url)) <> Serv_url and mid(From_url,8,len(Serv_url))<>"ITstudy.cn" and mid(From_url,8,len(Serv_url))<>"www.ITstudy.cn" then
response.write "您下载的软件来自IT学习网,请直接从主页下载,谢谢<br>" ’防止盗链
response.write "<a href=http://www.ITstudy.cn>IT学习网http://www.ITstudy.cn</a>" ’防止盗链
response.end
end if
%>
第二种:
<%
’定义函数,用ADODB.Stream读取二进制数据
Function ReadBinaryFile(FileName)
Const adTypeBinary = 1
Dim BinaryStream
Set BinaryStream = CreateObject("ADODB.Stream")
BinaryStream.Type = adTypeBinary
BinaryStream.Open
BinaryStream.LoadFromFile FileName
ReadBinaryFile = BinaryStream.Read
End Function
Response.AddHeader "Content-Disposition", "attachment;filename=2.gif"’文件名
Response.ContentType = "image/GIF" ’设置(1)
response.Binarywrite ReadBinaryFile(server.mappath("2.gif"))’就是你读取存在本地的文件,防止被
别人知道真实路径盗连的。
%>
(1)下面的示例将 ContentType 属性设置为其他的常见值。
text/HTML 这个就不说了
image/GIF gif图片
image/JPEG jpg图片
application/x-cdf cdf文档
application/wma 就是西瓜哪个音乐类型了
具体可以参照 Web 浏览器文档或当前的 HTTP 规格说明
这样再利用asp的储存session,cookies,以及读取HTTP头等特殊功能就可以完全真正的实现防盗连,这里
没有设置缓存,如果访问量巨大,我想设置下就会更好吧。
第三种:
最简单的用Active Server Pages防站外提交表单、跨站提交表单、防盗链……
方法:Request.SeverVariables("HTTP_REFERER")
解释:当某人通过链接到达当前页,HTTP_REFERER 就保存了这个用户的来源(来路)
举个例子,这个例子很简单,只是抛砖引玉而已,大家可以增加更多的功能。
如下,只有首先从“ http://www.ITstudy.cn”登陆才能看到文件内容。
源码:index.asp
<html>
<head><title>最简单的用asp防盗链</title></head>
<body>
<%
Option.Explicit
Response.Buffer=Ture
%>
<%
CheckUrl("http://ITstudy.cn/index.jsp")
%>
<%
Function CheckUrl(url)
Dim Where:Where=Request.SeverVariables("HTTP_REFERER")
If Where=url Then
Call main()
Else
Response.write("很抱歉,您必须从"&url&"访问才能进来!")
End if
End Function
%>
<%
Sub main()
Response.write("这儿是你要显示的网页内容")
End sub
%>
</body>
</html>
该方法对防止盗链文章、站外提交表单、跨站提交表单还比较有效,对于软件盗链比如.rar.zip.exe等倒没什么作用。
不知各位读者是否有好的主意,呵呵。
还有一种方法就是用判断服务器及上一页的地址来完成。
<%
dim from, local
from = request.ServerVariables("HTTP_REFERER")
local = request.ServerVariables("SERVER_NAME")
If mid(from, 8, local)<>Len(local) Then
response.write "不要从外部提交数据"
else
call main()
end if
sub main()
’你的主体内容
end sub
%>