iis7 用url write 模块实现泛解析 二级域名重写？该如何处理

iis7 用url write 模块实现泛解析 二级域名重写？？
怎么实现？
二级域名重写
要求是 
1.www.site.com/ccc都重写到www.site.com/index.php/ccc

2.ccc.site.com重写到ccc.site.com/index.php/ccc

我如下写的 1实现了 但是2怎么都有问题。不知道怎么办 求助

XML code

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<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <rewrite>
            <rules>
                <clear />
                <rule name="重写规则1 对于 域名泛解析" stopProcessing="true">
                    <match url=".*" />
                    <conditions logicalGrouping="MatchAll" trackAllCaptures="false">
                        <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
                        <add input="{HTTP_HOST}" pattern="([^.www]+)\.site\.com" />
                    </conditions>
                    <action type="Rewrite" url="index.php/{C:1}" appendQueryString="true" logRewrittenUrl="true" />
                </rule>
                <rule name="Imported Rule 1">
                    <match url="(.*)$" ignoreCase="false" />
                    <conditions logicalGrouping="MatchAny" trackAllCaptures="false">
                        <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
                    </conditions>
                    <action type="Rewrite" url="index.php/{R:1}" appendQueryString="true" logRewrittenUrl="true" />
                </rule>
            </rules>
            <rewriteMaps>
                <rewriteMap name="域名泛解析" />
            </rewriteMaps>
        </rewrite>
        <caching>
            <profiles>
                <remove extension=".html" />
                <add extension=".html" policy="DisableCache" kernelCachePolicy="DontCache" duration="00:00:30" />
            </profiles>
        </caching>
    </system.webSer

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