net-cat

About Project

This project consists on recreating the NetCat in a Server-Client Architecture that can run in a server mode on a specified port listening for incoming connections, and it can be used in client mode, trying to connect to a specified port and transmitting information to the server.

NetCat, nc system command, is a command-line utility that reads and writes data across network connections using TCP or UDP. It is used for anything involving TCP, UDP, or UNIX-domain sockets, it is able to open TCP connections, send UDP packages, listen on arbitrary TCP and UDP ports and many more.

To see more information about NetCat inspect the manual man nc.

Usage

$ go run ./cmd/main.go $port

Example

• 1st Terminal

$ go run ./cmd/main.go
Listening on the port :8080
2021/10/27 19:14:10 Connected 127.0.0.1:39744
2021/10/27 19:14:32 Connected 127.0.0.1:39750
2021/10/27 19:16:10 Connect 127.0.0.1:39750 was left
2021/10/27 19:16:13 Connect 127.0.0.1:39744 was left
^C2021/10/27 19:18:07 Closing Server
2021/10/27 19:18:07 Server Closed
$ 

• 2nd Terminal

$ nc 
Welcome to TCP-Chat!
         _nnnn_
        dGGGGMMb
       @p~qp~~qMb
       M|@||@) M|
       @,----.JM|
      JS^\__/  qKL
     dZP        qKRb
    dZP          qKKb
   fZP            SMMb
   HZM            MMMM
   FqM            MMMM
 __| ".        |\dS"qML
 |    `.       | `' \Zq
_)      \.___.,|     .'
\____   )MMMMMP|   .'
     `-'       `--'
[ENTER YOUR NAME]: Dias1c
[2021-10-27 19:14:10][Dias1c]:Hello? 
[2021-10-27 19:14:20][Dias1c]:!
nrblzn has joined our chat...
[2021-10-27 19:14:32][Dias1c]:!
[2021-10-27 19:14:43][nrblzn]:Hi
[2021-10-27 19:14:43][Dias1c]:Wow, How Are you?
[2021-10-27 19:15:04][Dias1c]:!
[2021-10-27 19:15:31][nrblzn]:I am good, thank you!
[2021-10-27 19:15:31][Dias1c]:!
[2021-10-27 19:15:51][nrblzn]:Lets play Lem-in
[2021-10-27 19:15:51][Dias1c]:HA-ha Go!
[2021-10-27 19:16:03][Dias1c]:!
nrblzn has left our chat...
[2021-10-27 19:16:10][Dias1c]:^C
$ 

• 3rd Terminal

$ nc localhost 8080
Welcome to TCP-Chat!
         _nnnn_
        dGGGGMMb
       @p~qp~~qMb
       M|@||@) M|
       @,----.JM|
      JS^\__/  qKL
     dZP        qKRb
    dZP          qKKb
   fZP            SMMb
   HZM            MMMM
   FqM            MMMM
 __| ".        |\dS"qML
 |    `.       | `' \Zq
_)      \.___.,|     .'
\____   )MMMMMP|   .'
     `-'       `--'
[ENTER YOUR NAME]: nrblzn
[2021-10-27 19:14:20][Dias1c]:Hello?
[2021-10-27 19:14:32][nrblzn]:Hi
[2021-10-27 19:14:43][nrblzn]:!
[2021-10-27 19:15:04][Dias1c]:Wow, How Are you?
[2021-10-27 19:15:04][nrblzn]:I am good, thank you!
[2021-10-27 19:15:31][nrblzn]:Lets play Lem-in
[2021-10-27 19:15:51][nrblzn]:!
[2021-10-27 19:16:03][Dias1c]:HA-ha Go!
[2021-10-27 19:16:03][nrblzn]:^C
$ 

Default settings

Default settings on main.go

MaxConnections = 10 // Max connections count
Port = ":8989"      // Default port if user not sets

Build

#Build project
$ go build -o TCPChat
#Usage
$ ./TCPChat $port

Authors

• Dias1c