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package socket
import (
"errors"
"fmt"
"log"
"net"
"strings"
"sync"
"tunnel/pkg/server/env"
"tunnel/pkg/server/opts"
"tunnel/pkg/server/queue"
)
var ErrAlreadyClosed = errors.New("already closed")
type Conn interface {
Send(wq queue.Q) error
Recv(rq queue.Q) error
Close() error
}
type S interface {
Open(env env.Env) (Conn, error)
Close()
}
type Single interface {
Single()
}
type conn struct {
net.Conn
desc string
info string
once sync.Once
}
func newConn(cn net.Conn, desc, info string) *conn {
c := &conn{Conn: cn, desc: desc, info: info}
return c
}
func (c *conn) Send(wq queue.Q) error {
return queue.IoCopy(c, wq.Writer())
}
func (c *conn) Recv(rq queue.Q) error {
return queue.IoCopy(rq.Reader(), c)
}
func (c *conn) String() string {
return c.info
}
func (c *conn) Close() error {
err := ErrAlreadyClosed
c.once.Do(func() {
log.Println("close", c.desc)
err = c.Conn.Close()
})
return err
}
func New(desc string) (S, error) {
base, opts := opts.Parse(desc)
args := strings.SplitN(base, "/", 2)
var proto string
var addr string
if len(args) < 2 {
addr = args[0]
} else {
proto, addr = args[0], args[1]
}
if proto == "" {
proto = "tcp"
}
switch addr {
case "loop":
return newLoopSocket()
case "proxy":
return newProxySocket(proto)
case "":
return nil, fmt.Errorf("bad socket '%s'", desc)
}
if proto == "tun" {
return newTunSocket(addr)
}
if opts.Bool("listen") {
return newListenSocket(proto, addr, opts)
}
if opts.Bool("defer") {
return newDeferSocket(proto, addr)
}
return newDialSocket(proto, addr)
}
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