Free server connections software for linux

Port forward is a java application which gives you the ability to open tunnels between your local computer and a remote ssh server. With Port forward, tunnels can be created both local or remote.

Examples:

1. Open a local tunnel to reach a remote mysql database

- Your application needs to connect to a remote database server (mysql for example), but the database server (remote.server.example) is not configured to expose mysql to internet directly.
- Port forward will open a local port (3306) and redirect the connections to remote.server.example ssh server
- The remote.server.example ssh server will connect to its local mysql server

2. Open a local tunnel to use a remove VNC desktop

- You want to connect to your home computer which has a vnc server but from work, the firewall blocks vnc connections (generally on port 5901)
- If you have a ssh server at home, you could use it as bridge to connect to a client in your home:

Your position internet your linux ssh server ->>
-->> you client with vnc (192.168.0.40)

you office
internet >

3. Open a remote tunnel to pilot a remote linux server non reachable through internet
In this example, you will create a remote tunnel, this will give the remote man to connect to and reach you.

I used this example if I have to pilot a remote pc, but this pc has no static IP or is behind a firewall
The good solution is to activate port forward on the pc to be piloted and to connect it to a server we can access.


PC 1 (to be piloted) --||||-- firewall ----- internet ----- accessible-server

Installation:

Be sure java is in you classpath
tar zxvf portforward.tar.gz
cd portForward
sh run_linux.sh

PicoGUI aims to be a complete GUI environment for handheld computers and other embedded systems. It uses a client/server model, like the X window system, but while an X server is given raw drawing commands, the PicoGUI server integrates a widget set, making PicoGUI clients small and efficient.
PicoGUI also has the goal of allowing client/server connections over a variety of mechanisms. It is most commonly used with Linux, but is designed to be portable to any OS. PicoGUI has a variety of video and input drivers which allow it to interface with the Linux framebuffer device, SDL, the X window system, and several other devices.
Main features:
Scalability:
PicoGUI applications can very easily be moved between a wide variety of platforms.
Consistency:
PicoGUI makes it easy for developers to separate presentation, layout, and content. This makes it easy to change the look and feel of an app, and for all apps to be consistent with each other.
Creativity:
PicoGUI is a chance to completely rethink the design behind a GUI system and try new things.
Modularity:
PicoGUI is designed to be tweaked and configured at compile-time to create a system thats right for any application. You can create large feature-packed binaries for the desktop, or simpler configurations for a wide range of embedded systems.

Cutter is an TCP/IP Connection cutting on Linux Firewalls and Routers.

Cutter is an open source program that uses the FIN-ACK-RST packet technique described above to abort TCP/IP connections routed over the firewall or router on which it is run. It can be called using one of the following four syntaxes.

cutter ip-address

Example: "cutter 10.10.0.45"

Cuts all connections passing through the firewall between any ports on the specified ip-address (either a "private" or "public" address) and any other hosts. This can be used to close down all incoming connections to a particular server, all outgoing connections from a particular client or all outgoing connections to a server.

cutter ip-address port

Example: "cutter 200.1.2.3 80"

Cuts all connections to or from the specified ip-address/port pair. This allows the user to be a little more specific than the previous example and allows targetting of specific services on specific hosts.

cutter ip-address-1 port-1 ip-address-2

Example "cutter 200.1.2.3 22 10.10.0.45"

Cuts all connections between ip-address-2 and ip-address-1/port-1. This allows the user to cut connections between a specified "client" and a particular service on a specified host. Our example closes host 10.10.0.45s SSH connection to server 200.1.2.3.

cutter ip-address-1 port-1 ip-address-2 port-2

Example: "cutter 200.1.2.3 22 10.10.0.45 32451"

Cuts the specific connection between the two ip/port number pairs given.

IMPORTANT WARNING

Cutter has been designed for use as a administrators tool for Linux firewalls. Its use (as is, or modified) for any other purpose is not sanctioned by the author. So - do not use this tool as a parachute, or to dry your cat, chill meat, answer your phone, drive you car, teach your kids to read or attack other peoples computer systems or networks.

This software has been designed for "legal" and "appropriate" use by network security administrators and the like. It has been written as part of a larger Linux firewall project, targetting at controlling traffic from peer-to-peer software such as Kazaa, iMesh and others into and out of a private network. It is not designed as a tool for malicious use and the author in no way sanctions such use.

Users of the software should be aware that its actions are easily detectable using a number of readily available network monitoring tools, and it makes no attempt to disguise its actions. Malicious use of "cutter" could result in a jail sentance in a number of countries around the world.

C++ Server Pages is a partial Java server pages and servlet implementation in C++. C++ Server Pages is written as Apache 2.0 modules, with the focus on performance.

LineControl allows you to remotely control the Internet connection of a Linux masquerading server using multiple clients. It takes care with the number of clients using the connection and decides upon this number whether the connection should be up or down.
The clients show the time the connection is up and throughput statistics. Different connection types are supported, such as analog modems, ISDN, or even cable modems and ADSL devices.
Main features:
- user accounting using Linux-PAM or passwd/shadow file
- controlling multiple lines
- throughput measuring
- logging & analizing (view example)
- logging to a MySQL database (view example)
- html formatted status report via webserver (view example)
- different line types (analog, isdn, adsl, ... it should be possible to run LC with any line!)
- pinger (to avoid line-drops)
- reporting data (time, nr, ...) about incoming isdn calls to the clients (inclusive addressbook lookup)
- client dependant modifications of the NAT servers firewall (using an external script whenever a client goes on- or offline)

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.

Jauus is a software patching program that works over the Internet by making a single TCP connection to a host server.

JAUUS project works on any Java-supported platform for any language or file type. The client/server sees each file as an object, and passes it over the network as such.

Appending to the short answer, jauus works like this. A connection is made to the server, some handshaking and communication is done and the server looks up the requested application file structure.

A global checksum is calculated as each files checksum is generated. This information is then passed to the client who does the exact same thing on his end. The master checksums are compared. If they do not match then each file is individually checked against the master list.

When the file fails to validate or does not exist that file is then downloaded from the server. When the validation process is over the client checks the config file and determines if the application is to be started and if so what command to execute.

Whats the inspiration? I had written an application for the support division that was constantly being changed for one ( I didnt remember to I thought I told you about that ) reason or another. Thats not so bad, Im paid to do that but what got under my skin was not everyone one is support would read the update emails and theyd wine about "it still doesnt sort by blah-blah". Anyways...I needed a program that they could run that would verify the files they are using and make sure they -always- had the latest version. So Jauus was brought to life.