Initial commit
commit
bba0bb6613
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.DS_Store
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forward
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# forward
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A simple TCP proxy.
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## Usage
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```
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$ ./forward -help
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Usage of ./forward:
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-connect string
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forward to ip and port (default ":8080")
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-listen string
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listen on ip and port (default ":8081")
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```
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package main
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import (
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"flag"
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"io"
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"log"
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"net"
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)
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var listen string
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var connect string
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func main() {
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flag.StringVar(&listen, "listen", ":8000", "listen on ip and port")
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flag.StringVar(&connect, "connect", "", "forward to ip and port")
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flag.Parse()
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// check and parse address
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conn, err := net.ResolveTCPAddr("tcp", connect)
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if err != nil {
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flag.PrintDefaults()
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log.Fatal(err)
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}
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// listen on address
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ln, err := net.Listen("tcp", listen)
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if err != nil {
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flag.PrintDefaults()
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log.Fatal(err)
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}
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log.Printf("listening on %v", ln.Addr())
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log.Printf("will connect to %v", conn)
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for i := 0; ; i++ {
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// accept new connection
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c, err := ln.Accept()
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if err != nil {
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log.Fatal(err)
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}
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log.Printf("connection %v from %v", i, c.RemoteAddr())
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cn, err := net.DialTCP("tcp", nil, conn)
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if err != nil {
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c.Close()
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log.Print(err)
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continue
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}
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go pipe(c, cn, i)
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go pipe(cn, c, i)
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}
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}
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func pipe(w io.WriteCloser, r io.ReadCloser, count int) {
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n, err := io.Copy(w, r)
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r.Close()
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w.Close()
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log.Printf("connection %v closed, %v bytes", count, n)
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opError, ok := err.(*net.OpError)
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if err != nil && (!ok || opError.Op != "readfrom") {
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log.Printf("warning! %v", err)
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}
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}
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