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The http_access entries already defined in the squid.conf file, along with an entry for the mylan network, are shown here. Access to outside users is denied, whereas access by hosts on the local network and the localhost (squid server host) is allowed.
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http_access allow localhost http_access allow mylan http_access deny all
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You can also qualify addresses by domain. Often, Web sites can be referenced using only the domain. For example, a site called www.mybeach.com can be referenced using just the domain mybeach.com. To create an acl entry to reference a domain, use either the dstdomain or srcdomain options for destination and source domains, respectively.
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Remember, such a reference refers to all hosts in that domain. An acl entry with the dstdomain option for mybeach.com restricts access to www.mybeach.com, ftp.mybeach.com, surf.mybeach.com, and so on. The following example restrictsaccess to the www.mybeach.com site along with all other .mybeach.com sites and any hosts in the mybeach.com domain:
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You can list several domains or addresses in an acl entry to reference them as a group, but you cannot have one domain that is a subdomain of another. For example, if mybeachblanket.com is a subdomain of mybeach.com, you cannot list both in the same acl list. The following example restricts access to both mybeach.com and mysurf.com:
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An acl entry can also use a pattern to specify certain addresses and domains. In the following example, the access is denied to any URL with the pattern "chocolate", and allows access from all others:
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Squid also supports ident and proxy authentication methods to control user access. The following example only allows the users dylan and chris to use the Squid cache:
ident_lookup on acl goodusers user chris dylan http_access allow goodusers http_access deny all
Caches
Squid uses the Internet Cache Protocol (ICP) to communicate with other Web caches. Using the ICP protocols, your Squid cache can connect to other Squid caches or other cache servers, such as Microsoft proxy server, Netscape proxy server, and Novell BorderManager. This way, if your network's Squid cache does not have a copy of a requested Web page, it can contact another cache to see if it is there instead of accessing the original site. You can configure Squid to connect to other Squid caches by connecting it to a cache hierarchy. Squid supports a hierarchy of caches denoted by the terms child, sibling, and parent. Sibling and child caches are accessible on the same level and are automatically queried whenever a request cannot be located in your own Squid's cache. If these queries fail, a parent cache is queried, which then searches its own child and sibling caches-or its own parent cache, if needed-and so on. Use cache_host to set up parent and sibling hierarchical connections:
cache_host sd.cache.nlanr.net parent 3128 3130
You can set up a cache hierarchy to connect to the main NLANR server by registering your cache using the following entries in your squid.conf file:
cache_announce 24 announce_to sd.cache.nlanr.net:3131
Squid keeps several logs. access.log holds requests sent to your proxy, cache.log holds Squid server messages such as errors and startup messages, and store.log holds information about the Squid cache such as objects added or removed. You can use the cache manager (cachemgr.cgi) to manage the cache and view statistics on the cache manager as it runs. To run the cache manager, use your browser to execute the cachemgr.cgi script (this script should be placed in your Web server's cgi-bin directory). You can also monitor Squid using the Multi Router Traffic utility.
Dig Server
Dig, known officially as ht:/Dig, is a Web indexing and search system designed for small networks or intranets. Dig is not considered a replacement for full-scale Internet search systems, such as Lycos, Infoseek, or Alta Vista. Unlike Web server-based search engines, Dig can span several Web servers at a site. Dig was developed at San Diego State University and is distributed free under the GNU Public License. You can obtain information and documentation at www.htdig.org, and you can download software packages-including RPM packages-from ftp.htdig.org. Dig supports simple and complex searches, including complex Boolean and fuzzy search methods. Fuzzy searching supports a number of search algorithms, including exact, soundex, and synonyms. Searches can be carried out on both text and HTML documents. HTML documents can have keywords placed in them for more accurate retrieval, and you can also use HTML templates to control how results are displayed. Searches can be constrained by authentication requirements, location, and search depth. To protect documents in restricted directories, Dig can be informed to request a specific username and password. You can also restrict a search to retrieve documents in a certain URL, to search subsections of the database, or to retrieve only documents that are a specified number of links away. All the ht:/Dig programs use the same configuration file, htdig.conf, located in the /etc/htdig directory. The configuration file consists of attribute entries, each beginning with the attribute line and followed by the value after a colon. Each program takes only the attributes it needs:
max_head_length: 10000
You can specify attributes such as allow_virtual_hosts, which index virtual hosts (see 25) as separate servers, and search_algorithm, which specifies the search algorithms to use for searches. Dig consist of five programs: htdig, htmerge, htfuzzy, htnotify, and htsearch. htdig, htmerge, and htfuzzy generate the index, while htsearch performs the actual searches. First, htdig gathers information on your database, searching all URL connections in your domain and associating Web pages with terms. The htmerge program uses this information to create a searchable database, merging the information from any previously generated database. htfuzzy creates indexes to allow searches using fuzzy algorithms, such as soundex and synonyms. Once the database is created, users can use Web pages that invoke htsearch to
search this index. Results are listed on a Web page. You can use META tags in your HTML documents to enter specific htdig keywords, exclude a document from indexing, or provide notification information such as an e-mail address and an expiration date. htnotify uses the email and expiration date to notify Web page authors when their pages are out-of-date. htsearch is a CGI program that expects to be invoked by an HTML form, and it accepts both the GET and POST methods of passing data. The htsearch program can accept a search request from any form containing the required configuration values. Values include search features such as config (configuration file), method (search method), and sort (sort criteria). For the Web page form that invokes htsearch, you can use the default page provided by htdig or create your own. Output is formatted using templates you can modify. Several sample files are included with the htdig software: rundig is a sample script for creating a database, searchform.html is a sample HTML document that contains a search form for submitting htdig searches, header.html is a sample header for search headers, and footer.html is for search footers.
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