tinyproxy的filter应用

想对代理的目标访问机器做一些限制，限制其只能够访问限定的主机。本来想修改tinyproxy的代码，一直找借口拖延，今天亮亮找我下载论文的时候，我想起这件事来。

拿出tinyproxy的代码，发现有个filter_init还有filter_url等函数，猜想tinyproxy已经有了filter功能了。

查看/etc/tinyproxy/tinyproxy.conf中：
#
# The location of the filter file.
#
#Filter "/etc/tinyproxy/filter"

#
# Filter based on URLs rather than domains.
#
#FilterURLs On

#
# Use POSIX Extended regular expressions rather than basic.
#
#FilterExtended On

#
# Use case sensitive regular expressions.
#                                                                        
#FilterCaseSensitive On    

#
# Change the default policy of the filtering system.  If this directive is
# commented out, or is set to "No" then the default policy is to allow
# everything which is not specifically denied by the filter file.
#
# However, by setting this directive to "Yes" the default policy becomes to
# deny everything which is _not_ specifically allowed by the filter file.
#
#FilterDefaultDeny Yes

我们可以直接设置filter来实现：只对限定站点的代理，其他的不代理。

我们修改配置文件为：

Filter "/etc/tinyproxy/filter"
FilterURLs On
FilterDefaultDeny Yes

这样tinyproxy只能够代理filter文件中指定的URL，我们在filter文件中添写上我们的目标代理主机就可以了：
hit.edu.cn