blocks|key|1933801|text|有没有可能向不在线的人发送这样的数据包会导致错误？在这种情况下，发送数据包但没有收到错误表示此人在线。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1933802|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Is it possible that sending such a packet to someone who's not online results in an error? In that case, sending the packet and not getting an error means that that person is online.

blocks|key|1936124|text|当你是隐形的时候，基本上你是online，但他们的服务器不会广播你的真实状态(在线)，而是一个假的(离线)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1936125|雅虎不能完全“隐藏”你的真实状态，但它在如何积极尝试方面存在一些“漏洞”：详情请参阅here。|1936126|实际上，有很多websites和可能的间谍软件使得最终用户更容易检查。|1936127|entityMap|0|LINK|mutability|MUTABLE|url|http://www.webstuffscan.com/2007/08/15/yahoo-messenger-invisible-hack-how-to-find-if-someone-is-really-offline/|1|http://www.imvisible.info/^0|E|6|0|16|4|0|0|7|8|1|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|W|8|@]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|H|3|I|5|6|7|10|8|@]|D|@$9|11|A|12|1|13]]|E|$]]|$1|J|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|K|$L|$5|M|N|O|E|$P|Q]]|R|$5|M|N|O|E|$P|S]]]]

When you are invisible, basically you are online, but simply their server do not broadcast your real status (online), but a fake one (offline).

Yahoo is not fully able to "hide" your real status, but it has some "holes" in how aggressively tries: see <a href="http://www.webstuffscan.com/2007/08/15/yahoo-messenger-invisible-hack-how-to-find-if-someone-is-really-offline/" rel="nofollow noreferrer">here</a> for details.

Actually there are lot of <a href="http://www.imvisible.info/" rel="nofollow noreferrer">websites</a> and possible spyware that make it even easier for an end-user to check.

blocks|key|1933829|text|根据您所说的，我建议机器人实际上检查其他地方(如果它是真的，根本没有发送数据包)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1933830|会不会有在线用户的在线注册表，而发送给您的数据包只是一个人工制品？|1933831|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

From what you are saying, I'd suggest that the bot actually checks somewhere else (if it is true that there are no packets sent at all)

Could it be that there is an online registry of users who are online and the packet that you are sent is just an artifact?

blocks|key|734257|text|这是一个新的答案，因为它太长了，不能作为评论。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|734258|我环顾了一下周围，似乎老版本的雅虎有一个交易，如果你是隐形的，有人试图与你开始语音聊天，它会出卖你。ping数据包可能正在尝试这样做。|734259|我在gtalk上注意到的一件事是，用户经常显示在线，即使在他们断开连接后，直到有人给他们发送ping数据包。此外，如果你是隐形的，然后又回来了，那么你在线的时间长度就会暴露出你是隐形的事实。|734260|那么，会不会是，当你被doing时，你的状态，在线时间等所有更新在雅虎服务器上，如果你在线，这些服务正在做什么，然后检查雅虎是否采取了任何行动？我会假设雅虎所做的一切并不是在广播你的信息，但你仍然可以看到服务器做了一些事情。|734261|与其监视传入/传出的数据包，为什么不在yahoo服务器上检查您的注册表？我相信有一个url就是这样的。|734262|希望这能帮上忙|734263|Mechko|734264|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|S|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|T|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|U|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|V|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|O|$]]

This is a new answer because it's too long to be a comment.

I looked around a bit and it would seem that the older versions of yahoo had a deal where if you were invisible and someone tried to start a voice chat with you, it would give you away. The ping packet could be trying that.

One thing I noticed on gtalk was that often a user appears online even after they have disconnected until someone sends them a ping packet. Also, if you are invisible and then you come back, the length of time that you've been online gives away the fact that you were invisible.

Could it be, then, that when you are pinged, your status, online time, etc all update on the yahoo server if you are online and what these services are doing then are checking to see if yahoo takes any action? I would presume that all yahoo is doing is not broadcasting your info if you're online, but you can still see that the server does something.

Instead of monitoring for an incoming/outgoing packet, why don't you check your registry on the yahoo server? I believe there's a url for that.

hope this helps,

Mechko

blocks|key|2143138|text|我好久没有用过Yahoo+Messenger了，但是你说的一些话让我很好奇。你说这些测试网站给你发了一个C1包。我想知道屏蔽除Yahoo服务器之外的所有服务器是不是就像防火墙规则一样简单。我不知道聊天/语音/文件传输是不是通过P2P完成的，如果是这样的话，你必须更新你的防火墙规则。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2143139|以前，我经常使用防火墙来屏蔽IM客户端上的广告横幅，因为它们是在不同的URL上提供服务的，而无法连接到广告服务器并不会断开我的IM通道。|2143140|也许你可以让防火墙请求每个连接，看看你需要多少连接才能让信使工作。然后让防火墙丢弃未经请求的数据包。如果这不起作用，您可以使用防火墙来阻止检查站点。|2143141|祝好运。|2143142|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

I hadn't used Yahoo Messenger is a long time, but something you said made me wonder. You said these testing websites sent you a C1 packet. I'm wondering if it is as simple a firewall rules to block all but the Yahoo servers. I don't know if chat/voice/file transfers are done P2P, if so you would have to update your firewall rules.

Back in the day I used to use my firewall to block the ad banners on the IM clients because they were served on a different URL and failure to connect to the ad server didn't disconnect my IM channel.

Maybe you can have the firewall ask for each connection and see how few connections you need in order to have the messenger work. Then have the firewall drop unsolicited packets.
If that doesn't work, you can use the firewall to block the checking sites.

Good luck.

blocks|key|734391|text|以下是您可以用来检测用户是否不可见或真正脱机的一些方法(其中一些方法依赖于messenger应用程序的早期版本)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|734392|734393|开始与您要检查的用户进行语音聊天。如果出现错误，说明用户确实处于脱机状态。|ordered-list-item|734394|会向用户发送一条消息，然后更改IMEnviorment。如果您看到一条消息说“正在等待您的朋友加载主题”，那么用户如果真的在您的浏览器中offline.|734395|Download+(并为其付费)+Buddy+Check.|offset|length|734396|Navigate到这个URL：http://opi.yahoo.com/online?m=g&t=2&u=userid+(更改您正在测试的用户的userid+)。(这对我不起作用)。|734397|734398|有一些网站可以让你在线查看状态，但不能保证它们会正常工作(它们只是在做我上面展示给你的事情)。基本上，你可以通过屏幕抓取来使用它们。以下是一些站点：|734399|734400|http://www.ydetector.com/|unordered-list-item|734401|http://www.imvisible.info/|734402|http://www.invisible.ir/|734403|http://www.invisible-scanner.com/+(这个最适合我)|734404|734405|entityMap|0|LINK|mutability|MUTABLE|url|http://www.nuotex.com/buddycheck/|1|http://opi.yahoo.com/online?m=g&t=2&u=userid|2|3|4|5|http://www.invisible-scanner.com/^0|0|0|0|0|H|B|0|0|F|18|1|0|0|0|0|0|P|2|0|0|Q|3|0|0|O|4|0|0|X|5|0|0^^$0|@$1|2|3|4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|1I|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|1J|8|@]|9|@]|A|$]]|$1|H|3|I|5|E|7|1K|8|@]|9|@$J|1L|K|1M|1|1N]]|A|$]]|$1|L|3|M|5|E|7|1O|8|@]|9|@$J|1P|K|1Q|1|1R]]|A|$]]|$1|N|3|-4|5|6|7|1S|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|1T|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1U|8|@]|9|@]|A|$]]|$1|R|3|S|5|T|7|1V|8|@]|9|@$J|1W|K|1X|1|1Y]]|A|$]]|$1|U|3|V|5|T|7|1Z|8|@]|9|@$J|20|K|21|1|22]]|A|$]]|$1|W|3|X|5|T|7|23|8|@]|9|@$J|24|K|25|1|26]]|A|$]]|$1|Y|3|Z|5|T|7|27|8|@]|9|@$J|28|K|29|1|2A]]|A|$]]|$1|10|3|-4|5|6|7|2B|8|@]|9|@]|A|$]]|$1|11|3|-4|5|6|7|2C|8|@]|9|@]|A|$]]]|12|$13|$5|14|15|16|A|$17|18]]|19|$5|14|15|16|A|$17|1A]]|1B|$5|14|15|16|A|$17|S]]|1C|$5|14|15|16|A|$17|V]]|1D|$5|14|15|16|A|$17|X]]|1E|$5|14|15|16|A|$17|1F]]]]

Here are some of the methods you can use to detect if a user is invisible or really offline (some of these depend on earlier versions of the messenger application):

<ol>
<li>Start a voice chat with the user you want to check. If you get an error, the user if really offline.</li>
<li>Send a message to the user, then change the IMEnviorment. If you see a message saying “waiting for your friend to load the theme”, then the user if really offline.</li>
<li>Download (and pay for, unfortunately) <a href="http://www.nuotex.com/buddycheck/" rel="nofollow noreferrer">Buddy Check</a>.</li>
<li>Navigate to this URL in your browser: <a href="http://opi.yahoo.com/online?m=g&amp;t=2&amp;u=userid" rel="nofollow noreferrer">http://opi.yahoo.com/online?m=g&amp;t=2&amp;u=userid</a> (change userid to the user you are testing). (This did not work for me).</li>
</ol>

There are websites that let you can check the status online, but there is no guarantee they'll work (they're only doing what I am showing you above). Basically, you can use these VIA screen scraping. Here are some of the sites:

<ul>
<li><a href="http://www.ydetector.com/" rel="nofollow noreferrer">http://www.ydetector.com/</a></li>
<li><a href="http://www.imvisible.info/" rel="nofollow noreferrer">http://www.imvisible.info/</a></li>
<li><a href="http://www.invisible.ir/" rel="nofollow noreferrer">http://www.invisible.ir/</a></li>
<li><a href="http://www.invisible-scanner.com/" rel="nofollow noreferrer">http://www.invisible-scanner.com/</a> (This one has worked best for me)</li>
</ul>

Some friends with the help of various sites check and know when i'm invisible on yahoo messenger and keep bragging about this. 

Being curious about this I've tested lots of sites that check if a user is invisible on yahoo messenger and all of them sent me a C1 packet type. 
From what i've tested I'm(my ymsgr client) not sending anything back. So i only receive 1 packet from the bot that performs the check and that's it, they know if i'm invisible or not. 

Next i thought that if i'm not sending anything back then maybe the yahoo server sends something back to i tested on a friend of mine and i sent him a c1 packet but i did not received anything back from nobody (neither the server neither my friend). 
So how do they do that? I'm just looking for some hints, not expecting for code or someone else to solve it for me. I just like the thrill in learning and discovering by myself just that now i'm stuck with no idea :) 

Thanks.

Yahoo invisible

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

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一些朋友在不同网站的帮助下检查并知道我在雅虎信使上是隐形的，并不断吹嘘这一点。出于好奇，我测试了很多网站，检查用户是否在雅虎信使上是隐形的，所有这些网站都给我发送了一个C1类型的数据包。根据我的测试，我(我的ymsgr客户端)没有发回任何东西。所以我只从执行检查的机器人那里收到一个数据包，就这样，他们知道我是否隐形。接...

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