ASP下载系统防盗链三种方法
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[p]第一方法[/p]
[p] 两个文件，第一个文件（例子中的index.asp）负责产生随机的下载链接，并将密匙写入cookie；第二个文件（例子中的download.asp）根据cookie找到实际下载地址，然后使用response.addheader和server.transfer来重定向地址。为什么不使用response.redirect呢？是因为response.redirect是在客户端的重定向。如果使用response.redirect，那么真实的下载地址还是传给了客户端，这样防盗链的作用就小了很多，用myie等等浏览器或工具都可以轻易的获得真实下载地址。而iis5.0中提供的server.transfer是服务器端的重定向，与客户端无关，这样客户端就无法获得真实的下载地址。[/p]
[p] 下面是id为1的下载文件ttt.exe的防盗链示例程序，具体内容如下：[/p]
[p]<!---------------index.asp----------------->[br]<%response.buffer = true%>[br]<html>[br]<head>[br]</head>[br]<body>[br]<%[br]response.write "下载地址：<br><br>"[br]randomize[br]x = int(rnd()*1000)[br]response.write "<a href='download.asp?id=" & 1*x & "'>ttt.exe</a>"[br]'这里只是简单的运算，呵呵，这已经足够了。[br]response.cookies("secret") = x[br]%>[br]</body>[br]</html>[/p]
[p]<!---------------download.asp----------------->[br]<%[br]response.buffer = true[br]if request.cookies("secret") = "" then response.end[br]if not isnumeric(request.cookies("secret")) then response.end[br]'这里对传递过来的值没有多加判断，只是为了节省篇幅[br]secret = clng(request.cookies("secret"))[br]id = clng(request.querystring("id"))[br]if id/secret = 1 then[br] response.addheader "content-type","application/x-msdownload"[br] response.addheader "content-disposition","attachment;filename=ttt.exe"[br]server.transfer "ttt.exe"[br]else[br]response.write "error!"[br]end if[br]%>[/p]
[p][br]第二方法[br]打开文件 softdown.asp 在： [br]if request.querystring("id")="" then [br]response.write "不能连接或者没有指定下载软件" [br]response.end [br]end if [br]的上面或者是下面加上下列代码[/p]
[p][br]dim strreferer,domain,spldomain,ishttp [br]ishttp=false[/p]
[p]本站下载cn-media.com/i-v/index.shtm>系统网址列表，不要带上http:// [br]domain="sron.net,61.156.14.223,61.156.14.227"[/p]
[p]spldomain=split(domain,",") [br]strreferer=request.servervariables("http_referer") [br]for iii = 0 to ubound(spldomain) [br]if instr(strreferer,trim(spldomain(iii)))>0 then ishttp=true [br]next [br]if isnull(strreferer) or ishttp=false then [br]response.write "下载链接来自其他网站，这是不允许的，<a href=""./"">请进入本站页面后再进行下载。</a>" [br]closedatabase [br]response.end [br]end if[/p]
[p]本站下载cn-media.com/i-v/index.shtm>系统网址列表 就是访问你下载频道网址里的域名，比如你的下载频道可以用多个网址来访问，所以这里用逗号隔开.[/p]
[p]当然这里的防盗链只是相对的，只要知道了软件存放地址，防盗链就不管用了. [/p]
[p]第三方法[/p]
[p]用asp实现防盗链技术（带自动返回功能）[/p]
[p]源文件代码：[br]------------------------------------------------------------------------------------------------------------------------[br]<%[br]from_url = cstr(request.servervariables("http_referer"))[br]serv_url = cstr(request.servervariables("server_name"))[br]if mid(from_url,8,len(serv_url)) <> serv_url then[br]response.write "<b>非法链接！<br><span id=yu>3</span><a href=javascript:countdown></a>秒钟后cn-media.com/i-v/index.shtm>系统将自动返回首页......</b>"[br]response.write "<meta http-equiv=refresh content=3;url=index.asp>"[br]response.write "<script>valignbottom()</script>"[br]response.write "<script>function countdown(secs){yu.innertext=secs;if(--secs>0)settimeout('countdown('+secs+')',1000);}countdown(3);</script>"[br]response.end[br]end if[/p]
function getfilename(longname)'/folder1/folder2/file.asp=>file.asp[br]while instr(longname,"/")[br]longname = right(longname,len(longname)-1)[br]wend[br]getfilename = longname[br]end function[br]dim stream[br]dim contents[br]dim filename[br]dim truefilename[br]dim fileext[br]const adtypebinary = 1[br]filename = request.querystring("filename")[br]if filename = "" then[br]response.write "无效文件名！"[br]response.end[br]end if[br]fileext = mid(filename, instrrev(filename, ".") + 1)[br]select case ucase(fileext)[br]case "asp", "asa", "aspx", "asax", "mdb"[br] response.write "非法操作！"[br] response.end[br]end select[br]response.clear[br]response.addheader "content-disposition", "attachment; filename=" & getfilename(request.querystring("filename"))[br]set stream = server.createobject("adodb.stream")[br]stream.type = adtypebinary[br]stream.open[br]if lcase(right(filename,3))="rar" then '设置文件类型[br]truefilename = "/files/"&filename '设置文件目录的相对路径[br]end if [br]stream.loadfromfile server.mappath(truefilename)[br]while not stream.eos[br]response.binarywrite stream.read(1024 * 64)[br]wend[br]stream.close[br]set stream = nothing[br]response.flush[br]response.end[br]%>
该文章在 2010/6/27 17:29:39 编辑过 |
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