105 lines
2.3 KiB
Go
105 lines
2.3 KiB
Go
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package main
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import (
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"crypto/tls"
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"fmt"
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"io"
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"net"
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"os"
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"strconv"
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"strings"
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)
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type SclientOpts struct {
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RemoteAddress string
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RemotePort int
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LocalAddress string
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LocalPort int
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InsecureSkipVerify bool
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}
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type Sclient struct{}
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func pipe(r net.Conn, w net.Conn, t string) {
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buffer := make([]byte, 2048)
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for {
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done := false
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// NOTE: count may be > 0 even if there's an err
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count, err := r.Read(buffer)
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//fmt.Fprintf(os.Stdout, "[debug] (%s) reading\n", t)
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if nil != err {
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//fmt.Fprintf(os.Stdout, "[debug] (%s:%d) error reading %s\n", t, count, err)
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if io.EOF != err {
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fmt.Fprintf(os.Stderr, "[read error] (%s:%s) %s\n", t, count, err)
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}
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r.Close()
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//w.Close()
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done = true
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}
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if 0 == count {
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break
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}
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_, err = w.Write(buffer[:count])
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if nil != err {
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//fmt.Fprintf(os.Stdout, "[debug] %s error writing\n", t)
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if io.EOF != err {
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fmt.Fprintf(os.Stderr, "[write error] (%s) %s\n", t, err)
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}
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// TODO handle error closing?
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r.Close()
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//w.Close()
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done = true
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}
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if done {
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break
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}
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}
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}
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func handleConnection(remote string, conn net.Conn, opts *SclientOpts) {
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sclient, err := tls.Dial("tcp", remote,
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&tls.Config{InsecureSkipVerify: opts.InsecureSkipVerify})
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if err != nil {
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fmt.Fprintf(os.Stderr, "[error] (remote) %s\n", err)
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conn.Close()
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return
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}
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fmt.Fprintf(os.Stdout, "[connect] %s => %s:%d\n",
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strings.Replace(conn.RemoteAddr().String(), "[::1]:", "localhost:", 1), opts.RemoteAddress, opts.RemotePort)
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go pipe(conn, sclient, "local")
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pipe(sclient, conn, "remote")
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}
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func (*Sclient) DialAndListen(opts *SclientOpts) error {
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remote := opts.RemoteAddress + ":" + strconv.Itoa(opts.RemotePort)
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conn, err := tls.Dial("tcp", remote,
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&tls.Config{InsecureSkipVerify: opts.InsecureSkipVerify})
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if err != nil {
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fmt.Fprintf(os.Stderr, "[warn] '%s' may not be accepting connections: %s\n", remote, err)
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} else {
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conn.Close()
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}
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local := opts.LocalAddress + ":" + strconv.Itoa(opts.LocalPort)
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ln, err := net.Listen("tcp", local)
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if err != nil {
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return err
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}
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fmt.Fprintf(os.Stdout, "[listening] %s:%d <= %s:%d\n",
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opts.RemoteAddress, opts.RemotePort, opts.LocalAddress, opts.LocalPort)
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for {
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conn, err := ln.Accept()
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if nil != err {
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fmt.Fprintf(os.Stderr, "[error] %s\n", err)
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continue
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}
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go handleConnection(remote, conn, opts)
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}
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}
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