chargen-go's Introduction

Chargen-Go

Chargen protocol implementation as per RFC 864 and RFC 865. Ipv6 friendly.

Client also has ability to spoof source IPs for chargen DDoS amplication attacks.

A Cli tool chargen-go, provides the ability to stand up a server and use a client.

Installation

go get -u github.com/rek7/chargen-go

Install cli tool to $GOPATH/bin

go install github.com/rek7/chargen-go

Cli Command

$ ~/go/bin/chargen-go
chargen - Wrapper for github.com/rek7/chargen-go library to stand up a server or run a client.

Usage:
  chargen [command]

Available Commands:
  client      Chargen UDP/TCP client
  completion  Generate the autocompletion script for the specified shell
  help        Help about any command
  server      Chargen TCP/UDP client

Flags:
  -h, --help   help for chargen

Use "chargen [command] --help" for more information about a command.

Server Example

TCP

package main

import (
	"net"

	"github.com/rek7/chargen-go/pkg/chargen"
)

func main() {
	ln, err := net.Listen("tcp", ":19")
	if err != nil {
		// handle error
	}
	server := chargen.NewServer()
	server.ServeTCP(ln)
}

UDP

package main

import (
    "net"

    "github.com/rek7/chargen-go/pkg/chargen"
)

func main() {
    ln, err := net.ListenUDP("udp", &net.UDPAddr{
        Port: 19,
        IP:   net.ParseIP("0.0.0.0"),
    })
    if err != nil {
        // handle error
    }
    server := chargen.NewServer()
    server.ServeUDP(ln)
}

Client Example

package main

import (
    "fmt"
    "net"

    "github.com/rek7/chargen-go/pkg/chargen"
)

func main() {
    client, err := chargen.NewClient("tcp", "127.0.0.1:19")
    if err != nil {
        // handle error
    }
    defer client.Close()

    // Used to spoof Source IP for amplification attacks. Leave a blank IP if you want it to randomly
    // generate a public ip.
    client.UpdateSrcIP(net.IP("192.168.1.1"))

    // Specify 0 to generate a packet random within the size 1-512 bytes.
    client.Write(0)

    for {
        line, err := client.Read()
        if err != nil {
            // handle error
        }
        fmt.Println(string(line))
    }
}

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