Free open proxy software for linux

Blitzed Open Proxy Monitor or BOPM, is an open source open proxy monitor, designed for use with hybrid-based ircds, although it can be used with slight modification on any server which has the ability to show connects to opers and that supports KLINEs.
BOPM is known to work without modification on the following ircds:
- Bahamut (tested with 1.4.28, 1.4.30)
- Hybrid (tested with 2.8/hybrid-5.3p8, ircd-hybrid-6.3 and ircd-hybrid-7)
- ircd-ratbox (tested with > 2.1.8)
- charybdis (tested with > 2.0.0)
- Unreal (tested with 3.1.2 and 3.2)
- Dancer (tested with 1.0.31)
- TR-IRCD
- IRCu
- Ultimate (tested with UltimateIRCd 2.8.8 and 3.0.0.b3) - please note, earlier versions of Ultimate IRCD are not supported
- LiquidIRCd (tested with 1.0.4)
- InspIRCd (known to work with 1.0 and 1.1 version branches - instructions are given here)
Please note that BOPM will not work with older versions of Unreal without modifying Unreal to send the clients IP address in a connection notice. Patches are also available for download. On the latest versions of Unreal this is no longer needed. Remember for all Unreal versions you must set the perform line correctly (documented in the config file).
How does it work?
When a client connects to the IRC server, BOPM scans the client for open proxies. It then determines whether they are really open by using them to connect back to the server.
How does BOPM improve on first generation scanners (wgmon, tcm, oomon)?
It extends them by adding support for SOCKS4, SOCKS5, WinGate, HTTP proxies, insecure Cisco routers, simultaneous connections, and a more scalable model (written in C). BOPM also has support for a DNS blacklist, similar to MAPS RBL+ or Visi RSL
BOPM is in use without issue on servers receiving over 400 connections per minute during normal real-world operation (as in, regular client load excluding bursts and attacks). That is 7 user connections per second, enough for even the largest of IRC servers.
Additionally, BOPM contains the ability to match hosts against a DNS blacklist such as DroneBL or your own custom list, it can also submit new proxies that are found via email if the list accepts them.
Enhancements:
- This version was fixed to work with GCC 4 and various other cleanups.

Spike Proxy is an open source HTTP proxy for finding security flaws in web sites.

SPIKE Proxy is part of the Spike Application Testing Suite and supports automated SQL injection detection, web site crawling, login form brute forcing, overflow detection, and directory traversal detection.

To Use:

python spkproxy.py [ optional port argument, 8080 is default ]
Then set up your browser to use that port for both HTTP and
HTTPS proxies.

Then watch the traffic go!

IMAP Proxy server is a caching IMAP proxy server. It was written to compensate for webmail clients that are unable to maintain persistent connections to an IMAP server. Most webmail clients need to log in to an IMAP server for nearly every single transaction.

This behaviour can cause tragic performance problems on the IMAP server. imapproxy tries to deal with this problem by leaving server connections open for a short time after a webmail client logs out.

When the webmail client connects again, imapproxy will determine if theres a cached connection available and reuse it if possible.

How does imapproxy keep track of which server connection is for which user?

Upon the first successful login to the real IMAP server (through the proxy), imapproxy fills in a little record that contains the username, an md5 digital signature of the password and the server socket descriptor thats being used.

After you log out and then log back in again, imapproxy just has to find a record that matches your username and password. These records are stored in a hash table (with the username being the hash key) in memory, so the lookups are pretty fast.

Can IMAP Proxy support multiple backend servers?

If you want IMAP Proxy to be able to proxy to multiple backend IMAP servers, you can run multiple instances of IMAP Proxy and make sure each instance is looking at a different configuration file.

Before you do this, take a look at perdition which appears to have been designed with this specific task in mind.

BlockStop Proxy is a Firefox extension that allows you to view the current page or link using.

Adds a "View this page with BlockStop" or "Open Link Target with BlockStop" option to your Firefox right-click menu, depending on where you click. The BlockStop Proxy extension automatically encodes the target url to maintain anonymity.

Wake On LAN proxy allows machines behind a gateway/firewall to be woken up. You have a constant connection to the Internet, but you are away from base. All machines except the gateway are powered off while you are away. Remotely you decide you want to access one of your machines. You need to power it up first. For machines with suitable NICs there is the Wake On LAN mechanism. But this doesnt work over the Internet because you would have to route a packet to your internal network. The firewall stops you from doing that, for good reasons. Even if you were able to route a packet, you wouldnt want this information to travel in the clear, otherwise other people who intercept your packets could learn how to turn on your machines remotely too. So you need some kind of authentication and privacy.

Enter Wake On LAN proxy. This runs on your gateway, or on some other machine on the network thats always on, and can be reached from the Internet by port forwarding. You can send a command to it to wake a particular machine and it broadcasts a suitable packet on the internal network.

Japt-Proxy is a JAVA based Caching Proxy for Debians APT-System. Japt-Proxy is very reliable and lightning fast. Japt-Proxy is usually used in environments where several Debian systems have to be kept up-to-date without downloading the same files over and over again from the debian mirrors. Mostly these environments are data centers, Linux-powered companies, schools, public authorities and so on.
Often Japt-Proxy is used because of small sized internet connections but it is also useful to install complete debian systems over the net (read: over the proxy). Even with high volume internet connections Japt-Proxy can dramatically reduce the time to install or update Debian on many machines.
Why Java?
I know there are people out there thinking "Hey? Why Java?". There are a bunch of reasons why people asking those questions. I have a simple answer to all those questions. The answer is, that Java enabled me to easily develop the fastest and most reliable APT-Proxy. Java and the Apache Software Foundation provides such good libraries for this job, that it wasnt very hard to bring up this tool.
If you dont trust, test it - the installation takes less than five minutes!
Doesnt a general proxy server supersede an APT-Proxy?
No, it doesnt. Japt-Proxy knows the characteristics of a Debian archive and their files. It knows, for example, that .deb files wont change, because newer files would have a new name (the version is always part of the filename), hence it wont recheck if there is a newer version of this specific file.
Furthermore you can configure the Japt-Proxy to delete old versions of a package in its cache directory - a general proxy cache would simple delete files that havent been requested for some time.
So, a general caching proxy like Squid is a perfect tool for caching "normal" internet traffic. If you need a proxy for faster APT access - Japt-Proxy is the right tool for you.
Main features:
- Caching of all apt requests from Debian archives
- Multi-threaded architecture which increases the download speed enormously when several machines are requesting packages
- Builds up a partial mirror directory automatically, with exactly the same directory structure and filenames as the original mirror
- Automatic and configurable cache cleanup (purging packages in cache if newer versions exists)
- Makes sources.list configuration easier for multiple machines - if you change your internet backend server you only have to make the change once in Japt-Proxy, instead of on all Debian machines
- Works with multiple architectures
- Backend support for HTTP and FTP
- existing .debs can be copied into the Japt-Proxy cache directory (from a CD or DVD for example) and will be used by the Proxy automatically

Net::Proxy is a Perl framework for proxying network connections in many ways.

SYNOPSIS

use Net::Proxy;

# proxy connections from localhost:6789 to remotehost:9876
# using standard TCP connections
my $proxy = Net::Proxy->new(
{ in => { type => tcp, port => 6789 },
out => { type => tcp, host => remotehost, port => 9876 },
}
);

# register the proxy object
$proxy->register();

# and you can setup multiple proxies

# and now proxy connections indefinitely
Net::Proxy->mainloop();

A Net::Proxy object represents a proxy that accepts connections and then relays the data transfered between the source and the destination.

The goal of this module is to abstract the different methods used to connect from the proxy to the destination.
A proxy is a program that transfer data across a network boundary between a client and a server. Net::Proxy introduces the concept of "connectors" (implemented as Net::Proxy::Connector subclasses), which abstract the server part (connected to the client) and the client part (connected to the server) of the proxy.

This architecture makes it easy to implement specific techniques to cross a given network boundary, possibly by using a proxy on one side of the network fence, and a reverse-proxy on the other side of the fence.

YAZ Proxy application is highly configurable and can be used in a number of different applications, ranging from debugging Z39.50-based applications and protecting overworked servers, to improving the performance of stateless WWW/Z39.50 gateways.
Main features:
- Configurable logging
- SRU/SRW server function, to allow any Z39.50 server to also support the ZiNG protocols
- Load balancing across multiple backend servers
- Session-sharing and pre-initialization to improve performance in servers with expensive session initialization
- Configurable request filtering, to keep bad requests from reaching the server
- XML support -- MARC records can be converted to MARCXML, and XSLT-transformations allow the proxy to support arbitrary retrieval schemas in XML
- Load governor function limits requests from aggressive batch-mode clients
- Efficient multiplexing software enables small memory footprint and very high performance
NOTE: The YAZ Proxy, a complete application, is available under the GPL license. Other licensing terms are available to commercial vendors upon request.