gonc

Overview

gonc is a netcat-like utility implemented in Go. It enables simple TCP/UDP networking tasks such as sending and receiving data, making it useful for debugging, file transfers, and scripting network operations.

Features

• Can function as both client and server
• TCP and UDP protocols
• Unix sockets
• SSL
• Proxy
• Port scanning
• Verbose logging
• Timeouts
• Telnet
• Interval

Installation

To build gonc from source:

git clone https://github.com/npezzotti/gonc.git
cd gonc
make build

Usage

Start a TCP server

./gonc -listen 8000

Connect as a TCP client

./gonc localhost 8000

Send a message

echo "Hello, world!" | ./gonc localhost 8000

Transfer a file

On the receiver (server):

./gonc -listen 8000 > received_file.txt

On the sender (client):

./gonc localhost 8000 < file_to_send.txt

Command-line Options

Option	Description
-listen	Listen mode (server)
-udp	Use UDP instead of TCP
-unix	Use Unix domain sockets
-ipv4	Use IPv4 addresses only
-ipv6	Use IPv6 addresses only
-nostdin	Do not attempt to read from stdin
-keep	When a connection is completed, listen for another one (requires -listen and TCP/Unix)
-no-shutdown	Do not shutdown the network socket after EOF on the input
-no-dns	Do not resolve hostnames to IP addresses
-sourceaddr	Set the source address to send packets from
-port	The source port gonc should use, subject to privilege restrictions and availability
-timeout	Connections which cannot be established or are idle timeout after specified seconds
-scan	Scan for listening daemons, without sending any data to them
-telnet	Send RFC 854 DON'T and WON'T responses to RFC 854 DO and WILL requests
-verbose	Enable more verbose output
-interval	Sleep for interval seconds between lines of text sent and received; also functions as delay when scanning ports
-ssl	Use SSL
-cert	Specify SSL certificate file (PEM) for listening
-key	Specify SSL private key (PEM) for listening
-no-verify	Do not verify trust and domain name of certificates
-trustfile	PEM file containing trusted SSL certificates
-ciphers	Comma-separated list of SSL cipher suites
-servername	Request distinct server name (SNI)
-alpn	Comma-separated list of ALPN protocols to use
-proxy	Specify address of host to proxy through
-proxy-type	Proxy protocol to use when communicating to the proxy server (5 for SOCKS v5, connect for HTTPS proxy)
-proxy-auth	Specify proxy authentication credentials (username:password)
-version	Show version
-help	Show help message