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package main

import (
	"encoding/hex"
	"fmt"
	"io"
	"log"
	"net"
	"sync"
)

const (
	notice    = "ownme.ipredator.se:80"
	web       = "ownme.ipredator.se:443"
	server    = "ownme.ipredator.se:10000"
	client    = "ownme.ipredator.se:10001" // will callback to port 40001
	clientRev = "ownme.ipredator.se:10002"
)

type Direction string

const (
	ServerClient Direction = "Server → Client"
	ClientServer Direction = "Client → Server"
)

type Data struct {
	Round int
	Dir   Direction
	Data  []byte
}

func dump(dir Direction, src, dst net.Conn, data chan<- Data) error {
	buf := make([]byte, 4096)
	r := io.TeeReader(src, dst)
	for k := 1; ; k++ {
		n, err := r.Read(buf)
		if err != nil {
			if err == io.EOF {
				return nil
			}
			return err
		}
		data <- Data{Round: k, Dir: dir, Data: buf[:n]}
	}
}

func main() {
	var wg sync.WaitGroup

	srv, err := net.Dial("tcp", server)
	if err != nil {
		log.Fatal(err)
	}
	defer srv.Close()

	cnt, err := net.Dial("tcp", clientRev)
	if err != nil {
		log.Fatal(err)
	}
	defer cnt.Close()

	data := make(chan Data, 1)

	wg.Add(2)
	go func() {
		wg.Wait()
		close(data)
	}()

	go func(dir Direction) {
		if err := dump(dir, srv, cnt, data); err != nil {
			log.Println(dir, err)
		}
		wg.Done()
	}(ServerClient)

	go func(dir Direction) {
		if err := dump(dir, cnt, srv, data); err != nil {
			log.Println(dir, err)
		}
		wg.Done()
	}(ClientServer)

	for d := range data {
		fmt.Println("#", d.Round, d.Dir, len(d.Data), "bytes")
		fmt.Println(hex.Dump(d.Data))
	}
}