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README.md

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+# netcat
+The source code is taken from https://joncraton.org/blog/46/netcat-for-windows/. This version includes the -e parameter.
+
+<h2>UPDATE 11/08/21</h2>
+
+Updated files to compile in Visual Studio 2019. Be sure to build the project as x86 to avoid errors.
+
+<h2>UPDATE 12/27/04</h2>
+
+security fix in -e option for Windows
+
+<h2>Netcat 1.11 for NT - nc111nt.zip</h2>
+
+The original version of Netcat was written by *hobbit* <[email protected]>
+The NT version was done by Weld Pond <[email protected]>
+
+Netcat for NT is the tcp/ip "Swiss Army knife" that never made it into any 
+of the resource kits.  It has proved to be an extremely versatile tool on 
+the unix platform. So why should NT always be unix's poor cousin when it 
+comes to tcp/ip testing and exploration?  I bet many NT admins out there
+keep a unix box around to use tools such as Netcat or to test their systems
+with the unix version of an NT vulnerability exploit.  With Netcat for NT
+part of that feeling disempowerment is over.
+
+Included with this release is Hobbit's original description of the powers 
+of Netcat.  In this document I will briefly describe some of the things an
+NT admin might want to do and know about with Netcat on NT.  For more
+detailed technical information please read hobbit.txt included in the
+nc11nt.zip archive.
+
+     Basic Features
+
+     * Outbound or inbound connections, TCP or UDP, to or from any ports
+     * Full DNS forward/reverse checking, with appropriate warnings
+     * Ability to use any local source port
+     * Ability to use any locally-configured network source address
+     * Built-in port-scanning capabilities, with randomizer
+     * Can read command line arguments from standard input
+     * Slow-send mode, one line every N seconds
+     * Hex dump of transmitted and received data
+     * Ability to let another program service established
+       connections
+     * Telnet-options responder
+
+     New for NT
+
+     * Ability to run in the background without a console window
+     * Ability to restart as a single-threaded server to handle a new
+       connection
+
+
+A simple example of using Netcat is to pull down a web page from a web
+server.  With Netcat you get to see the full HTTP header so you can see
+which web server a particular site is running.
+
+Since NT has a rather anemic command processor, some of the things that are
+easy in unix may be a bit more clunky in NT. For the web page example first
+create a file get.txt that contains the following line and then a blank
+line:
+
+<code>GET / HTTP/1.0</code>
+
+To use Netcat to retrieve the home page of a web site use the command:
+<code>nc -v www.website.com 80 < get.txt</code>
+
+You will see Netcat make a connection to port 80, send the text contained
+in the file get.txt, and then output the web server's response to stdout.
+The -v is for verbose.  It tells you a little info about the connection
+when it starts.
+
+It is a bit easier to just open the connection and then type at the console
+to do the same thing. 
+<code>nc -v www.website.com 80</code>
+
+Then just type in GET / HTTP/1.0 and hit a couple of returns.  You will 
+see the same thing as above.
+
+A far more exciting thing to do is to get a quick shell going on a remote
+machine by using the -l or "listen" option and the -e or "execute"
+option.  You run Netcat listening on particular port for a connection.
+When a connection is made, Netcat executes the program of your choice
+and connects the stdin and stdout of the program to the network connection.
+
+<code>nc -l -p 23 -t -e cmd.exe</code>
+
+will get Netcat listening on port 23 (telnet).  When it gets connected to
+by a client it will spawn a shell (cmd.exe).  The -t option tells Netcat
+to handle any telnet negotiation the client might expect.
+
+This will allow you to telnet to the machine you have Netcat listening on
+and get a cmd.exe shell when you connect.  You could just as well use 
+Netcat instead of telnet:
+
+<code>nc xxx.xxx.xxx.xxx 23</code>
+
+will get the job done.  There is no authentication on the listening side
+so be a bit careful here.  The shell is running with the permissions of the
+process that started Netcat so be very careful.  If you were to use the
+AT program to schedule Netcat to run listening on a port with the 
+-e cmd.exe option, when you connected you would get a shell with user
+NT AUTHORITY\SYSTEM.
+
+The beauty of Netcat really shines when you realize that you can get it
+listening on ANY port doing the same thing.  Do a little exploring and
+see if the firewall you may be behind lets port 53 through.  Run Netcat
+listening behind the firewall on port 53.  
+
+<code>nc -L -p 53 -e cmd.exe</code>
+
+Then from outside the firewall connect to the listening machine:
+
+<code>nc -v xxx.xxx.xxx.xx 53</code>
+
+If you get a command prompt then you are executing commands on the
+listening machine.  Use 'exit' at the command prompt for a clean
+disconnect. The -L (note the capital L) option will restart Netcat with
+the same command line when the connection is terminated.  This way you can
+connect over and over to the same Netcat process.
+
+A new feature for the NT version is the -d or detach from console flag.
+This will let Netcat run without an ugly console window cluttering up the
+screen or showing up in the task list.
+
+You can even get Netcat to listen on the NETBIOS ports that are probably
+running on most NT machines.  This way you can get a connection to a
+machine that may have port filtering enabled in the TCP/IP Security Network
+control panel.  Unlike Unix, NT does not seem to have any security around
+which ports that user programs are allowed to bind to.  This means any
+user can run a program that will bind to the NETBIOS ports.
+
+You will need to bind "in front of" some services that may already be
+listening on those ports.  An example is the NETBIOS Session Service that
+is running on port 139 of NT machines that are sharing files.  You need
+to bind to a specific source address (one of the IP addresses of the 
+machine) to accomplish this.  This gives Netcat priority over the NETBIOS
+service which is at a lower priority because it is bound to ANY IP address.
+This is done with the Netcat -s option:
+
+<code>nc -v -L -e cmd.exe -p 139 -s xxx.xxx.xxx.xxx</code>
+
+Now you can connect to the machine on port 139 and Netcat will field
+the connection before NETBIOS does.  You have effectively shut off
+file sharing on this machine by the way.  You have done this with just
+user privileges to boot.
+
+PROBLEMS with Netcat 1.1 for NT
+
+There are a few known problems that will eventually be fixed.  One is
+the -w or timeout option.  This works for final net reads but not
+for connections.  Another problem is using the -e option in UDP mode.
+You may find that some of the features work on Windows 95.  Most
+of the listening features will not work on Windows 95 however.   These will
+be fixed in a later release.
+
+Netcat is distributed with full source code so that people can build
+upon this work.  If you add something useful or discover something 
+interesting about NT TCP/IP let met know.
+
+Weld Pond <[email protected]>, 2/2/98
+
+
+
+