Free proxy server software for linux

Firewall and Proxy Server HOWTO project is designed to describe the basics of firewall systems.

And also to give you some detail on setting up both a filtering and proxy firewall on a Linux based system.

Firewalls have gained great popularity as the ultimate in Internet Security.

Today firewalls are a part of almost every networking device. Like most hot subject they are also often misunderstood.

This HOWTO will go over the basics of what a firewall is and how to set one up.

I am using kernel 2.2.14 and RedHat 6.1 to develop this howto so the examples here are based on this distribution.

If you find differences in your distribution, please email me and Ill update this howto.

Proxy Detector is a PHP class that can detect HTTP requests via proxy. This class can detect if a visitor uses a proxy server by scanning the headers returned by the user client.
When the user uses a proxy server, most of the proxy servers alter the header. The header is returned to PHP in the array $_SERVER.
Enhancements:
- This is the first release of the class and implementation example.

DeniX Server OS is an independent Linux based distribution built from scratch by Denis Salmanovich. They aim to offer a user-friendly full-featured server operating system, pre-configured, well structured and easy to work with, and filled with the latest stable versions of Linux apps.
Its easy to install and configure. Every package is downloaded from the authors source and compiled when installed.
Main features:
- Domain Controller
- ADSL/CABLE Router (PPPoE)
- Network Firewall
- Anti Virus Gateway
- Anti Spam Gateway
- Mail Server (local & external) + Web Mail
- Calendar Sharing Support
- Network File Server
- DHCP Server
- TFTP BOOT Server
- WINS Server
- FTP Server
- VPN Server
- DNS Server
- DDNS Server
- MySQL Server
- HTTP Apache Server
- Remote Backup Solutions
- Remote control and administration
- Print Queue Server
- Proxy Server

Proxifier project is an easy to install three tier web proxy written in PHP.
Features include the ability to remove cookies, the HTTP referer field, the HTTP user-agent field, scripts on the page, and objects, altering the user-agent string to whatever you please, and tunnelling your proxied traffic through a second proxy.
If there existed a freely public install of this script, two standard proxies could be used, one entered in the proxy settings of your browser, and one entered into the publicly installed web proxy, to create a connection being passed between three separate proxy servers before hitting the final destination.
Most web sites should be supported by this web proxy. If a site doesnt seem to be supported, please email me. Please note, however, that most AJAX applications will probably have problems with Proxifier, so dont attempt to use anything like GMail or Meebo.
DO NOT USE THIS PROXY AS OF NOW TO ACCESS ANY SENSITIVE INFORMATION, INCLUDING BUT NOT LIMITED TO CREDIT CARD INFORMATION, SOCIAL SECURITY NUMBERS, SENSITIVE PASSWORDS, AND OTHER SIMILAR THINGS! Currently, SSL/TLS is supported through just entering a URL in the field. BEWARE: This does NOT secure your connection to the proxy server as of yet, only the connection from the proxy server to the web server the request is going to! This might create a false sense of security for some people, as your passwords are being passed openly without encryption through the Internet.
Enhancements:
- A major bug has been fixed where certain versions of the PCRE library would have issue with one of the regular expressions, causing many pages to not load at all.
- A bug where the base HTML tag was being parsed incorrectly has been fixed.
- Some instances of preg_match() have been replaced with other functions that were more efficient for the circumstances.

httptype is a program that returns the http host software of a website. It is written in Perl.
httptype reads a list of http hosts and optionally the port number for each of these. It queries each host, displaying the type of HTTP server running on that host. It reads the http_proxy and no_proxy environment variables to determine whether to use a proxy or not.
httptype reads a list of http servers and, optionally, the port number for each of these. It then queries each of the hosts and displays the HTTP server software of the host.
Input may be read from a host file if specified using the --hosts switch:
httptype --hosts [hostfile]
If hostfile is omitted or `-, httptype reads from standard input. See Format of host file for more info.
A single host may be queried by passing its name on the command line:
httptype host [port]
If port is omitted, 80 is used.
If no host file is specified through the --hosts file and no host is specified on the command line, httptype will read the list from standard input. See Format of host file for more info.
httptype will read the http_proxy environment variable and try to determine if a proxy server is being used. This setting may be overridden using the --proxy switch:
httptype --proxy proxyhost[:proxyport]
If proxyport is omitted, 80 is used.
If the proxy server is `none, no proxy is used. This is typically used to prevent httptype from using the proxy server specified by http_proxy. The --noproxy switch can be used to achieve the same.
Additionally, you may use the no_proxy environment variable to specify a comma delimited list of hosts for which httptype should not use the proxy. If httptype comes across any of these hosts, it will make a direct connection to them.
Enhancements:
- made 1.3.8 stable and renamed to 1.2.3

The Zaval Proxy Suite is an easy-to-use solution that allows monitoring TCP-based protocols, such as HTTP, NNTP and others. It is extremely useful in software development and can be used as a debug tool. Another area of appliance is multiple connections logging with proxy facilities. As soon as its a pure java solution it can be used almost everywhere.

The Zaval Proxy functions as a proxy and transfers data between the server and the client writing incoming and outgoing traffic into log files. So you can see these raw data as is.

On start the Zaval Proxy Suite goes through configuration file and creates the specified number of proxy servers and the shutdown server.

"Proxy server" is a server socket listening on the specified port. When the client is connected proxy connects to the target server and transfers data between them logging entire traffic. On each connection 2 files are created - xxx-input (request data from the client) and xxx-output (response data from the server). The "xxx" means here the sequential number of the connection for the proxy server. The traffic is logged into the separate directory for each proxy.

Shutdown server is needed to close all open connections correctly and close the program.

So, in the particular case you should specify address of proxy server in client application (web browser, for example) and address of the target server in the proxy configuration file. You can create any number of proxy servers that run at the same time, however, they should use different port numbers.

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