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package socket
import (
"fmt"
"log"
"net"
"strings"
"sync"
"tunnel/pkg/server/env"
"tunnel/pkg/server/opts"
"tunnel/pkg/server/queue"
)
type Channel interface {
Send(wq queue.Q) error
Recv(rq queue.Q) error
Close()
}
type S interface {
Open(env env.Env) (Channel, error)
Close()
}
type listenSocket struct {
proto, addr string
listen net.Listener
}
type dialSocket struct {
proto, addr string
}
type connChannel struct {
conn net.Conn
once sync.Once
}
func newConnChannel(conn net.Conn) Channel {
return &connChannel{conn: conn}
}
func (cc *connChannel) Send(wq queue.Q) (err error) {
defer cc.shutdown(&err)
return queue.IoCopy(cc.conn, wq.Writer())
}
func (cc *connChannel) Recv(rq queue.Q) (err error) {
defer cc.shutdown(&err)
return queue.IoCopy(rq.Reader(), cc.conn)
}
func (cc *connChannel) String() string {
local, remote := cc.conn.LocalAddr(), cc.conn.RemoteAddr()
return fmt.Sprintf("%s/%s->%s", local.Network(), remote, local)
}
func (cc *connChannel) shutdown(err *error) {
miss := true
cc.once.Do(func() {
miss = false
log.Println("close", cc)
if e := cc.conn.Close(); e != nil && *err != nil {
*err = e
}
})
if miss {
*err = nil
}
}
func (cc *connChannel) Close() {
var err error
cc.shutdown(&err)
}
func newListenSocket(proto, addr string) (S, error) {
if proto == "tcp" {
if !strings.Contains(addr, ":") {
addr = ":" + addr
}
}
listen, err := net.Listen(proto, addr)
if err != nil {
return nil, err
}
s := &listenSocket{
proto: proto,
addr: addr,
listen: listen,
}
return s, nil
}
func (s *listenSocket) Open(env env.Env) (Channel, error) {
conn, err := s.listen.Accept()
if err != nil {
return nil, err
}
return newConnChannel(conn), nil
}
func (s *listenSocket) String() string {
return fmt.Sprintf("%s/%s,listen", s.proto, s.addr)
}
func (s *listenSocket) Close() {
s.listen.Close()
}
func newDialSocket(proto, addr string) (S, error) {
switch proto {
case "tcp", "udp":
if !strings.Contains(addr, ":") {
addr = "localhost:" + addr
}
}
return &dialSocket{proto: proto, addr: addr}, nil
}
func (s *dialSocket) String() string {
return fmt.Sprintf("%s/%s", s.proto, s.addr)
}
func (s *dialSocket) Open(env env.Env) (Channel, error) {
conn, err := net.Dial(s.proto, s.addr)
if err != nil {
return nil, err
}
return newConnChannel(conn), nil
}
func (s *dialSocket) Close() {
}
func New(desc string, env env.Env) (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"
}
if addr == "" {
return nil, fmt.Errorf("bad socket '%s'", desc)
}
if _, ok := opts["listen"]; ok {
return newListenSocket(proto, addr)
}
return newDialSocket(proto, addr)
}
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