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weekly as 08:00 - 19:00 <br>
date *-*-01 08:00 - 16:30 <br>
date 2001.10.01 - 2001.10.09 <br>
} <br>
<br>
src admin { #源组定义 <br>
ip 192.168.100.18 <br>
} <br>
<br>
src client{ <br>
ip 192.168.100.20 192.168.100.21 192.168.100.22 <br>
ip 192.168.200.0/24 <br>
} <br>
<br>
dest porn { #目标组定义 <br>
domainlist porn/domains <br>
urllist porn/urls <br>
expressionlist porn/expressions <br>
} <br>
<br>
acl { #访问规则定义 <br>
admin within testtime { <br>
pass !porn all <br>
} else { <br>
pass all <br>
} <br>
<br>
client { <br>
pass !in-addr !porn all <br>
} <br>
<br>
default { <br>
pass none <br>
redirect http://admin.foo.com <br>
(#也可以重定向到一个含有一些信息的cgi页面,如下: <br>
http://admin.foo.com/cgi/blocked?clientaddr=%a&clientname=%n&clientuser=%i&clientgroup=%s&targetgroup=%t&url=%u) <br>
} <br>
} <br>
<br>
# vi db/porn/domains <br>
(域列表文件:主要是阻塞一些定义的站点) <br>
co.za <br>
sex.com <br>
(如上,可以阻塞如hack.co.za、sex.com、www.sex.com、whatever.sex.com,但是不同于.*[^.]sex.com,不匹配ssex.com) <br>
<br>
# vi db/porn/urls <br>
(url列表文件,主要是阻塞一些站点及其一些栏目) <br>
qihui.com/sex <br>
valen.sohu.com/album <br>
(如上可阻塞http://qihui.com/sex、http://qihui.com/sex/whatever、ftp://qihui.com/sex、http://www.qihui.com/sex等) <br>
<br>
# vi db/porn/expressions <br>
(表达式列表文件,主要是阻塞一些与表达式匹配的URL访问) <br>
(^|[?+=/])(.*)(girl)(.*)([?+=/]|$) <br>
(上面的正则表达式可以阻塞URL中包括girl站点的访问,如:www.girlzine.com、girl.huabao.net、www.huayu.net/girl、www.universiti.com/girl等 ) <br>
<br>
注意:squidGuard对配置文件的语法要求很严,如果配置文件语法有误,squidGuard仍能运行,但是squidGuard已进入应急模式,此时代理服务不具有任何阻塞作用,所有通过该代理的访问都可通过,可以查看logs/squidGuard的日志文件,即可发现错误,例如: <br>
2001-12-20 17:08:44 [2430] parse error in configfile /usr/local/squidGuard/squidGuard.conf line 8 <br>
2001-12-20 17:08:44 [2430] going into emergency mode <br>
……. <br>
其中配置文件第8行有误,squidGuard进入应急模式。 <br>
配置的具体说明详见http://www.squidguard.org/ <br>
<br>
四. 运行: <br>
$ chmod 777 /usr/local/squid/logs <br>
(设置logs对所有用户为可写。这样,不特定的squid代理客户才能正常访问代理服务器,并能在logs目录、产生access.log、cache.log等文件。) <br>
$ /usr/local/squid/bin/squid -z <br>
(手工建立squid的缓存目录/usr/local/squid/cache。) <br>
#/usr/local/squid/bin/squid <br>
(后台执行squid。如果想前台执行squid:如果你想前台执行Squid执行命令: <br>
  $/usr/local/squid/bin/squid -NCd1 <br>
  该命令正式启动Squid。如果一切正常,你会看到一行输出: <br>
  Ready to serve requests ) <br>
# ps ax|grep squid <br>
20198 ? S 0:00 /usr/local/squid/bin/squid <br>
20200 ? S 0:27 (squid) <br>
20310 ? S 0:00 (squidGuard) -c /usr/local/squidGuard/squidGuard.conf <br>
20311 ? S 0:00 (squidGuard) -c /usr/local/squidGuard/squidGuard.conf <br>
20312 ? S 0:00 (squidGuard) -c /usr/local/squidGuard/squidGuard.conf <br>
20313 ? S 0:00 (squidGuard) -c /usr/local/squidGuard/squidGuard.conf <br>
20314 ? S 0:00 (squidGuard) -c /usr/local/squidGuard/squidGuard.conf <br>
(此时squidGuard也已启用,每次修改配置后squid -k reconfigure重新起用即可,要杀掉squid执行squid -k kill) <br>
查看squidGuard日志文件: <br>
init domainlist /usr/local/squidGuard/db/porn/domains <br>
2001-12-20 16:14:43 [2270] init domainlist /usr/local/squidGuard/db/porn/domains <br>
2001-12-20 16:14:43 [2270] init urllist /usr/local/squidGuard/db/porn/urls <br>
2001-12-20 16:14:43 [2270] init expressionlist /usr/local/squidGuard/db/porn/expressions <br>
2001-12-20 16:14:43 [2270] squidGuard 1.1.4 started (1008836083.022) <br>
2001-12-20 16:14:43 [2270] recalculating alarm in 917 seconds <br>
2001-12-20 16:14:43 [2270] squidGuard ready for requests (1008836083.044) <br>
表示squidGuard已正常启动 <br>
<br>
五. 测试: <br>
配置客户端,然后测试代理服务: <br>
在另一台win2k上,(以Internet Explore5.0为例)运行IE,单击"工具",接着单击"Internet选项",再单击"连接"选项卡,单击"局域网设置";在"局域网设置"窗口中,在"地址"处填上squid服务器的IP地址192.168.100.16,在"端口"处填上"8080"(修改后squid代理使用的端口号,也就是squid.conf中的http_port,默认值为3128),确定后退出。 <br>
接下来,先把IP改成192.168.100.20,浏览一些网站,如sohu,163等,然后再试试domains和urls中定义的,如hack.co.za、qihui.com/sex,会发现主页被重定向到http://admin.foo.com。然后再试试浏览有关girl的网站,去不了了:(;在sohu中搜girl也被重定向了;用IP试试(有些代理程序对IP不做限制,用IP可以绕过代理的限制访问一些禁止的站点),可惜不行!(因为squidGuard配置文件中使用了!in_addr,所以可以强迫用户使用域名访问而不能使用ip访问) <br>
再下来,把IP改成192.168.100.18,然后时间改为testtime外的时间,浏览网页,试试结果,然后再将时间改为testtime内浏览网页! <br>
最后,把IP改成192.168.100.30,浏览网页测试。 <br>
(可以查看logs下的access.log和cache.log,看看是否代理运行正常以及访问的站点记录) <br>
<br>
总结: <br>
由上可见,用squid和squidGuard建立的代理服务器,配置比较简单,而且功能强大,可以有效的限制一些用户对internet的访问并过滤一些黑名单列出的站点(如色情站点等)。 <br>
这里只简单的介绍了关于http代理的例子,其它的应用和功能大家可以自己试试。 <br>
<br>
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