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With the exponential growth of the Internet, a central Whois database that provides host and network information of systems connected to the Internet, and electronic mail (email) addresses of the users of those systems has proven to be very inefficient. The sheer size and effort needed to maintain a centralized database necessitates an alternate, decentralized approach to storing and retrieving this information. RWhois is a Directory Services protocol which extends and enhances the Whois concept in a hierarchical and scaleable fashion. It focuses on the distribution of "network objects"--the data representing Internet resources or people--and uses the inherently hierarchical nature of these network objects (domain names, Internet Protocol (IP) networks, email addresses) to more accurately discover the requested information. RWhois synthesizes concepts from other, established Internet protocols to create a more useful way to find resources across the Internet. The RWhois protocol and architecture derive a great deal of structure from the Domain Name System (DNS) [RFC 1034] and borrow directory service concepts from other directory service efforts, primarily [X.500]. The protocol is also influenced by earlier established Internet protocols, such as the Simple Mail Transport Protocol (SMTP) [RFC 821] for response codes.

LWPx::ParanoidAgent is a class subclassing LWP::UserAgent, but paranoid against attackers. It's to be used when you're fetching a remote resource on behalf of a possibly malicious user. This class can do whatever LWP::UserAgent can (callbacks, uploads from files, etc), except proxy support is explicitly removed, because in that case you should do your paranoia at your proxy. Also, the schemes are limited to http and https, which are mapped to LWPx::Protocol::http_paranoid and LWPx::Protocol::https_paranoid, respectively, which are forked versions of the same ones without the "_paranoid". Subclassing them didn't look possible, as they were essentially just one huge function. This class protects you from connecting to internal IP ranges (unless you whitelist them), hostnames/IPs that you blacklist, remote webserver tarpitting your process (the timeout parameter is changed to be a global timeout over the entire process), and all combinations of redirects and DNS tricks to otherwise tarpit and/or connect to internal resources.

From the SquidClamav homepage: SquidClamav is an antivirus for Squid proxy based on the Awards winnings ClamAv anti-virus toolkit. Using it will help you securing your home or enterprise network web traffic. SquidClamav is the most efficient Squid Redirector and ICAP service antivirus tool for HTTP traffic available for free, it is written in C and can handle thousand of connections. The way to add more securing on your network for free is here. SquidClamav is build for speed and security in mind, it is first used and tested to secure a network with 2,500 and more users. It is also known to working fast with 15000+ users. With SquidClamav You have full control of what kind of HTTP stream must be scanned by Clamav antivirus, this control operate at 3 different levels: - At URL level, you can disable virus scanning for a set of web site, filename extension or anything that can be matched in an URL. - At client side by disabling virus scan and other redirector call to a set of username, source Ip addresses or computer DNS name. - At HTTP header level, where you can disable virus scanning following the content type or file size.