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|
package socket
import (
"errors"
"fmt"
"log"
"net"
"strings"
"tunnel/pkg/server/env"
"tunnel/pkg/server/opts"
)
type listenSocket struct {
proto, addr string
listen net.Listener
redirect bool
tproxy bool
}
func newListenSocket(proto, addr string, opts opts.Opts) (S, error) {
redirect := opts.Bool("redirect")
tproxy := opts.Bool("tproxy")
if proto == "tcp" {
if !strings.Contains(addr, ":") {
addr = ":" + addr
}
}
if redirect && proto != "tcp" {
return nil, errors.New("redirect not supported")
}
if tproxy && proto != "tcp" {
return nil, errors.New("tproxy not supported")
}
if redirect && tproxy {
return nil, errors.New("redirect and tproxy cannot be used together")
}
listen, err := net.Listen(proto, addr)
if err != nil {
return nil, err
}
if tproxy {
if err := setConnTransparent(listen); err != nil {
listen.Close()
return nil, err
}
}
s := &listenSocket{
proto: proto,
addr: addr,
listen: listen,
redirect: redirect,
tproxy: tproxy,
}
return s, nil
}
func (s *listenSocket) Open(env env.Env) (Conn, error) {
var original string
conn, err := s.listen.Accept()
if err != nil {
return nil, err
}
la, ra := conn.LocalAddr(), conn.RemoteAddr()
desc := fmt.Sprintf("%s/%s->%s", la.Network(), ra, la)
info := fmt.Sprintf("<%s/%s", ra.Network(), ra)
if s.redirect {
if err := getConnOriginalAddr(conn, &original); err != nil {
log.Println("accept", desc, "failed")
conn.Close()
return nil, err
} else {
env.Set("original", original)
}
}
if s.tproxy {
env.Set("original", la.String())
}
if original == "" {
log.Println("accept", desc)
} else {
log.Println("accept", desc, "original", original)
}
return newConn(conn, desc, info), nil
}
func (s *listenSocket) String() string {
return fmt.Sprintf("%s/%s,listen", s.proto, s.addr)
}
func (s *listenSocket) Close() {
s.listen.Close()
}
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