如何从浏览器检测用户是否正在远程桌面会话中运行？

发布于 2024-09-13 09:52:52 字数 677 浏览 5 评论 0原文

如果用户正在远程桌面会话中运行，是否有方法检查浏览器内部（例如 JavaScript）？

如果用户在远程桌面（即终端服务）内运行浏览器，我想禁用网站上的动画。

如果这是一个本机应用程序，而不是一个网站，我可以使用以下命令执行此检查：

//Native code
isRemoteSession = GetSystemMetrics( SM_REMOTESESSION );

或者

//Managed Code:
isRemoteSession = System.Windows.Forms.SystemInformation.TerminalServerSession;

是否可以在浏览器内完成类似的检查？

注意：出于本次讨论的目的，假设我们讨论的浏览器是 Internet Explorer 8。

更新一：也许如何从 javascript 获取终端服务客户端计算机名称？

原文

Is there a ways to check inside a browser (e.g. javascript) if the user is running inside a Remote Desktop session?

If the user is running their browser inside a Remote Desktop (i.e. Terminal Services), i want to disable animations on the web-site.

If this were a native application, as opposed to a web-site, i could perform this checking using:

//Native code
isRemoteSession = GetSystemMetrics( SM_REMOTESESSION );

//Managed Code:
isRemoteSession = System.Windows.Forms.SystemInformation.TerminalServerSession;

Is there a similar check that can be done inside the browser?

Note: Assume for the purposes of this discussion that the browser we're talking about is Internet Explorer 8.

Update One: Perhaps something in How can you get the terminal service client machine name from javascript?

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飘逸的'云 2024-09-20 09:52:52

我的解决方案是使用 CSS @media 查询 颜色媒体功能。根据实验，RDP 似乎每种颜色只有 5 位，而不是典型桌面的每种颜色完整的 8 位。

当然，这个解决方案并不完美，因为您会从那些没有使用 RDP、但碰巧拥有低颜色深度显示器的人那里得到很多误报。但是：

如果您处于企业内部网等相对受控的环境中，您可能会更有信心“低颜色深度”=“RDP”。
网页上许多需要针对 RDP 进行调整的视觉元素，正是由于颜色深度较低（渐变、淡出、动画等）而需要进行调整，因此它实际上是有意义的测试颜色深度而不是 RDP 本身。

这是一个在最新版本的 Firefox 和 Chrome 中适用于我的示例。请参阅下面的屏幕截图。

<!DOCTYPE html>
<html>
    <head>
        <title>Test RDP detection</title>
        <style type="text/css">
            @media all { li.color { display: none; } }
            @media all and (min-color: 1) { li.color.color-depth-1 { display: block; } }
            @media all and (min-color: 2) { li.color.color-depth-2 { display: block; } }
            @media all and (min-color: 3) { li.color.color-depth-3 { display: block; } }
            @media all and (min-color: 4) { li.color.color-depth-4 { display: block; } }
            @media all and (min-color: 5) { li.color.color-depth-5 { display: block; } }
            @media all and (min-color: 6) { li.color.color-depth-6 { display: block; } }
            @media all and (min-color: 7) { li.color.color-depth-7 { display: block; } }
            @media all and (min-color: 8) { li.color.color-depth-8 { display: block; } }

            /* 5 bits per color seems to be the max for RDP */
            @media all and (max-color: 5) {
                .not-rdp { display: none; }
            }
            @media all and (min-color: 6) {
                .rdp-only { display: none; }
            }
        </style>
    </head>
    <body>
        <p>This page uses CSS <tt>@media</tt> queries to detect whether you
            are viewing it over RDP—heuristically, by looking at the
            color depth of your display.</p>

        <ul>
            <li class="color color-depth-1">Your display is not monochrome!</li>
            <li class="color color-depth-2">Your display has at least 2 bits per color.</li>
            <li class="color color-depth-3">Your display has at least 3 bits per color.</li>
            <li class="color color-depth-4">Your display has at least 4 bits per color.</li>
            <li class="color color-depth-5">Your display has at least 5 bits per color.</li>
            <li class="color color-depth-6">Your display has at least 6 bits per color.</li>
            <li class="color color-depth-7">Your display has at least 7 bits per color.</li>
            <li class="color color-depth-8">Your display has at least 8 bits per color.</li>
        </ul>

        <p>You are <span class="not-rdp">not</span> using RDP.</p>
        <p class="rdp-only">This is only visible over RDP.</p>
    </body>
</html>

显示带有和不带有 RDP 的测试页面的屏幕截图

另一种方法是使用 javascript 来检查 screen.colorDepth 变量。

My solution is to use CSS @media queries for minimum and maximum values of the color media feature. Based on experiment, RDP only seems to have 5 bits per color, rather than the full 8 bits per color of your typical desktop.

This solution is, of course, not perfect, because you'll get lots of false positives from people who aren't on RDP, but just happen to have low color-depth displays. However:

If you are in a relatively controlled environment like a corporate intranet, you might feel more confident that "low color depth" = "RDP".
Many of the visual elements that need adjusting for RDP on a web-page, need adjusting precisely because of the low color depth (gradients, fade outs, animation, etc.), and so it actually makes sense to test for color depth rather than RDP per se.

Here is an example that works for me in recent version of Firefox and Chrome. See the screenshot below.

<!DOCTYPE html>
<html>
    <head>
        <title>Test RDP detection</title>
        <style type="text/css">
            @media all { li.color { display: none; } }
            @media all and (min-color: 1) { li.color.color-depth-1 { display: block; } }
            @media all and (min-color: 2) { li.color.color-depth-2 { display: block; } }
            @media all and (min-color: 3) { li.color.color-depth-3 { display: block; } }
            @media all and (min-color: 4) { li.color.color-depth-4 { display: block; } }
            @media all and (min-color: 5) { li.color.color-depth-5 { display: block; } }
            @media all and (min-color: 6) { li.color.color-depth-6 { display: block; } }
            @media all and (min-color: 7) { li.color.color-depth-7 { display: block; } }
            @media all and (min-color: 8) { li.color.color-depth-8 { display: block; } }

            /* 5 bits per color seems to be the max for RDP */
            @media all and (max-color: 5) {
                .not-rdp { display: none; }
            }
            @media all and (min-color: 6) {
                .rdp-only { display: none; }
            }
        </style>
    </head>
    <body>
        <p>This page uses CSS <tt>@media</tt> queries to detect whether you
            are viewing it over RDP—heuristically, by looking at the
            color depth of your display.</p>

        <ul>
            <li class="color color-depth-1">Your display is not monochrome!</li>
            <li class="color color-depth-2">Your display has at least 2 bits per color.</li>
            <li class="color color-depth-3">Your display has at least 3 bits per color.</li>
            <li class="color color-depth-4">Your display has at least 4 bits per color.</li>
            <li class="color color-depth-5">Your display has at least 5 bits per color.</li>
            <li class="color color-depth-6">Your display has at least 6 bits per color.</li>
            <li class="color color-depth-7">Your display has at least 7 bits per color.</li>
            <li class="color color-depth-8">Your display has at least 8 bits per color.</li>
        </ul>

        <p>You are <span class="not-rdp">not</span> using RDP.</p>
        <p class="rdp-only">This is only visible over RDP.</p>
    </body>
</html>

screenshot showing test page with and without RDP

Yet another approach along these lines is to use javascript to examine the value of the screen.colorDepth variable.

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