54 lines
981 B
Go
54 lines
981 B
Go
package main
|
|
|
|
import (
|
|
"context"
|
|
"flag"
|
|
"io"
|
|
"net"
|
|
|
|
"git.wntrmute.dev/kyle/goutils/die"
|
|
"git.wntrmute.dev/kyle/goutils/lib"
|
|
)
|
|
|
|
func proxy(conn net.Conn, inside string) error {
|
|
proxyConn, err := (&net.Dialer{}).DialContext(context.Background(), "tcp", inside)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
defer proxyConn.Close()
|
|
defer conn.Close()
|
|
|
|
go func() {
|
|
_, _ = io.Copy(conn, proxyConn)
|
|
}()
|
|
_, err = io.Copy(proxyConn, conn)
|
|
return err
|
|
}
|
|
|
|
func main() {
|
|
var outside, inside string
|
|
flag.StringVar(&outside, "f", "8080", "outside port")
|
|
flag.StringVar(&inside, "p", "4000", "inside port")
|
|
flag.Parse()
|
|
|
|
lc := &net.ListenConfig{}
|
|
l, err := lc.Listen(context.Background(), "tcp", "0.0.0.0:"+outside)
|
|
die.If(err)
|
|
|
|
for {
|
|
var conn net.Conn
|
|
conn, err = l.Accept()
|
|
if err != nil {
|
|
_, _ = lib.Warn(err, "accept failed")
|
|
continue
|
|
}
|
|
|
|
go func() {
|
|
if err = proxy(conn, "127.0.0.1:"+inside); err != nil {
|
|
_, _ = lib.Warn(err, "proxy error")
|
|
}
|
|
}()
|
|
}
|
|
}
|