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|
package socket
import (
"errors"
"fmt"
"log"
"net"
"tunnel/pkg/server/env"
)
type listenSocket struct {
Proto string `opts:"default:tcp"`
Addr string `opts:"required"`
Redirect bool
Tproxy bool
listen net.Listener
}
func (s *listenSocket) Prepare(e env.Env) error {
if s.Redirect && s.Proto != "tcp" {
return errors.New("redirect not supported")
}
if s.Tproxy && s.Proto != "tcp" {
return errors.New("tproxy not supported")
}
if s.Redirect && s.Tproxy {
return errors.New("redirect and tproxy cannot be used together")
}
proto, addr := parseProtoAddr(s.Proto, s.Addr)
listen, err := net.Listen(proto, addr)
if err != nil {
return err
}
e.Set("listen", listen.Addr().String())
if s.Tproxy {
if err := setConnTransparent(listen); err != nil {
listen.Close()
return err
}
}
s.listen = listen
return nil
}
func setOriginHostPort(env env.Env, origin, host, port string) {
env.Set("origin", origin)
env.Set("origin.host", host)
env.Set("origin.port", port)
}
func (s *listenSocket) New(env env.Env) (Conn, error) {
var origin string
conn, err := s.listen.Accept()
if err != nil {
return nil, err
}
ra := conn.RemoteAddr()
desc := fmt.Sprintf("%s/%s->%s", s.Proto, ra, s.Addr)
info := fmt.Sprintf("<%s/%s", ra.Network(), ra)
if s.Redirect {
host, port, err := getConnOriginalHostPort(conn)
if err != nil {
defer conn.Close()
return nil, fmt.Errorf("accept %s failed: %s", desc, err)
}
origin = net.JoinHostPort(host, port)
setOriginHostPort(env, origin, host, port)
}
if s.Tproxy {
origin = conn.LocalAddr().String()
host, port, err := net.SplitHostPort(origin)
if err != nil {
defer conn.Close()
return nil, fmt.Errorf("accept %s failed: %s", desc, err)
}
setOriginHostPort(env, origin, host, port)
}
if origin == "" {
log.Println("accept", desc)
} else {
log.Println("accept", desc, "origin", origin)
}
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()
}
func init() {
register("listen", "accept connections on the local network address", listenSocket{})
}
|
