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main.go
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main.go
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package main
import (
"crypto/tls"
"errors"
"io"
"log"
"net"
"os"
"strings"
)
func exit(err *error) {
if *err != nil {
log.Println("exited with error:", (*err).Error())
os.Exit(1)
}
}
var (
envBind = strings.TrimSpace(os.Getenv("FORWARD_BIND"))
envTarget = strings.TrimSpace(os.Getenv("FORWARD_TARGET"))
envTLSCrt = strings.TrimSpace(os.Getenv("FORWARD_TLS_CRT"))
envTLSKey = strings.TrimSpace(os.Getenv("FORWARD_TLS_KEY"))
)
func main() {
var err error
defer exit(&err)
if envBind == "" {
envBind = ":6443"
}
if envTarget == "" {
err = errors.New("missing environment $PROXY_TARGET")
return
}
if envTLSCrt == "" {
envTLSCrt = "/data/tls.crt"
}
if envTLSKey == "" {
envTLSKey = "/data/tls.key"
}
var c tls.Certificate
if c, err = tls.LoadX509KeyPair(envTLSCrt, envTLSKey); err != nil {
return
}
var l net.Listener
if l, err = tls.Listen("tcp", envBind, &tls.Config{
Certificates: []tls.Certificate{c},
}); err != nil {
return
}
for {
var c net.Conn
if c, err = l.Accept(); err != nil {
return
}
go handle(c, envTarget)
}
}
func handle(c net.Conn, target string) {
defer c.Close()
nc, err := net.Dial("tcp", target)
if err != nil {
log.Println("failed to dial:", target, ", error:", err.Error())
return
}
defer nc.Close()
go io.Copy(c, nc)
io.Copy(nc, c)
}