TGC is the TCP Gender Changer. Copyright (C) 2008-2014 Faraz V (faraz@fzv.ca) This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. Disclaimer: This program is provided with no warranty of any kind, either expressed or implied. It is the responsibility of the user (you) to fully research and comprehend the usage of this program. As with any tool, it can be misused, either intentionally or unintentionally. THE AUTHOR(S) IS(ARE) NOT RESPONSIBLE FOR ANYTHING YOU DO WITH THIS PROGRAM or anything that happens because of your use (or misuse) of this program. THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * Technical details: tgcd is a simple Unix network utility to extend the accessibility of TCP/IP based network services beyond firewalls. This can also be used by network analysts and security experts for penetration testing and analyze the security of their network. This program has 3 different modes: - CC (ConnectConnect) - LL (ListenListen) - PF (PortForwarder) CC and LL nodes are used together to provide access to a service inside a Local Area Network to the external network. PF node is, however, only a simple port forwarder. CC node resides in the LAN and connect to the LL (on the external network), and once a client connects to LL, then CC gets notified and establishes a connection to the server on the LAN. This program complies with host_access (aka libwrap), to control its accessibility. The idea is nothing new and there has been many implementation of it available already, namely: - revinetd (written by Steven M. Gill and Alexandre Carmel-Veilleux) available at: http://revinetd.sourceforge.net - An implementation using "socat" (an excellent network utility): http://www.dest-unreach.org/socat/doc/socat-gender.txt - FireWall Tunnel, available at: http://sourceforge.net/projects/firewall-tunnel/ - An artile explaining the idea: http://www.bandwidthco.com/whitepapers/netforensics/tcpip/TCP-IP%20Gender%20Changer.pdf There might be other implementations using netcat or other network utilities. For more information and examples on how to use this utility please refer to its man page (tgcd(1)). This software is provided only as a tool for network security analysts and penetration testers. We do not take any responsibility for any damage that can be done by using or misusing this software. Use it responsibilly and at your own risk (read the disclaimer above) NOTE: This software has only been tested on the following platforms: Linux 2.2.x (x86), 2.4.x (x86), 2.6.x (x86, ARM9, AVR32), Cygwin (1.5.x), NetBSD 2.1.0 Please feel free to send us your comments or any patches you may have to get tgc working on other platforms. * Install: git clone https://github.com/kirgene/tgcd cd tgcd autoreconf -ivf ./configure make su make install