87 lines
1.6 KiB
Go
87 lines
1.6 KiB
Go
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package main
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import (
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"io"
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"net"
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"os"
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"sync"
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"github.com/integrii/flaggy"
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"github.com/rs/zerolog"
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"github.com/rs/zerolog/log"
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)
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func main() {
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log.Logger = log.Output(zerolog.ConsoleWriter{Out: os.Stderr})
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var (
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listenAddr = ":8000"
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forwardAddr string
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)
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flaggy.String(&listenAddr, "l", "listen", "Address to listen on")
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flaggy.String(&forwardAddr, "f", "forward", "Address to forward to")
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flaggy.Parse()
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if forwardAddr == "" {
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log.Fatal().Msg("Forward address is required")
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}
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ln, err := net.Listen("tcp", listenAddr)
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if err != nil {
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log.Panic().Err(err).Msg("Failed to listen")
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}
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defer ln.Close()
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log.Info().Str("Listen Address", listenAddr).Msg("Listening")
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for {
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conn, err := ln.Accept()
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if err != nil {
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log.Err(err).Msg("Failed to accept connection")
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continue
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}
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log.Info().Str("Incoming Address", conn.RemoteAddr().String()).Msg("Connection accepted")
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go handleConnection(conn, forwardAddr)
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}
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}
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func handleConnection(conn net.Conn, forwardAddr string) {
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defer conn.Close()
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fwrd, err := net.Dial("tcp", forwardAddr)
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if err != nil {
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log.Err(err).Msg("Failed to connect to forward address")
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return
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}
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var wg sync.WaitGroup
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wg.Add(2)
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go func() {
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defer fwrd.Close()
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defer wg.Done()
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_, err := io.Copy(fwrd, conn)
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if err != nil {
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log.Err(err).Msg("Failed to copy from connection to forward address")
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}
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}()
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go func() {
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defer conn.Close()
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defer wg.Done()
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_, err := io.Copy(conn, fwrd)
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if err != nil {
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log.Err(err).Msg("Failed to copy from forward address to connection")
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}
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}()
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wg.Wait()
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log.Info().Str("Incoming Address", conn.RemoteAddr().String()).Msg("Connection closed")
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}
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