mirror of
https://gitclone.com/github.com/MetaCubeX/Clash.Meta
synced 2024-11-15 05:31:18 +08:00
126 lines
3.3 KiB
Go
126 lines
3.3 KiB
Go
package outbound
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"net"
|
|
"strconv"
|
|
|
|
"github.com/Dreamacro/clash/common/structure"
|
|
"github.com/Dreamacro/clash/component/dialer"
|
|
obfs "github.com/Dreamacro/clash/component/simple-obfs"
|
|
"github.com/Dreamacro/clash/component/snell"
|
|
C "github.com/Dreamacro/clash/constant"
|
|
)
|
|
|
|
type Snell struct {
|
|
*Base
|
|
psk []byte
|
|
pool *snell.Pool
|
|
obfsOption *simpleObfsOption
|
|
version int
|
|
}
|
|
|
|
type SnellOption struct {
|
|
Name string `proxy:"name"`
|
|
Server string `proxy:"server"`
|
|
Port int `proxy:"port"`
|
|
Psk string `proxy:"psk"`
|
|
Version int `proxy:"version,omitempty"`
|
|
ObfsOpts map[string]interface{} `proxy:"obfs-opts,omitempty"`
|
|
}
|
|
|
|
type streamOption struct {
|
|
psk []byte
|
|
version int
|
|
addr string
|
|
obfsOption *simpleObfsOption
|
|
}
|
|
|
|
func streamConn(c net.Conn, option streamOption) *snell.Snell {
|
|
switch option.obfsOption.Mode {
|
|
case "tls":
|
|
c = obfs.NewTLSObfs(c, option.obfsOption.Host)
|
|
case "http":
|
|
_, port, _ := net.SplitHostPort(option.addr)
|
|
c = obfs.NewHTTPObfs(c, option.obfsOption.Host, port)
|
|
}
|
|
return snell.StreamConn(c, option.psk, option.version)
|
|
}
|
|
|
|
func (s *Snell) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
|
|
c = streamConn(c, streamOption{s.psk, s.version, s.addr, s.obfsOption})
|
|
port, _ := strconv.Atoi(metadata.DstPort)
|
|
err := snell.WriteHeader(c, metadata.String(), uint(port), s.version)
|
|
return c, err
|
|
}
|
|
|
|
func (s *Snell) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
|
|
if s.version == snell.Version2 {
|
|
c, err := s.pool.Get()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
port, _ := strconv.Atoi(metadata.DstPort)
|
|
err = snell.WriteHeader(c, metadata.String(), uint(port), s.version)
|
|
return NewConn(c, s), err
|
|
}
|
|
|
|
c, err := dialer.DialContext(ctx, "tcp", s.addr)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("%s connect error: %w", s.addr, err)
|
|
}
|
|
tcpKeepAlive(c)
|
|
|
|
c, err = s.StreamConn(c, metadata)
|
|
return NewConn(c, s), err
|
|
}
|
|
|
|
func NewSnell(option SnellOption) (*Snell, error) {
|
|
addr := net.JoinHostPort(option.Server, strconv.Itoa(option.Port))
|
|
psk := []byte(option.Psk)
|
|
|
|
decoder := structure.NewDecoder(structure.Option{TagName: "obfs", WeaklyTypedInput: true})
|
|
obfsOption := &simpleObfsOption{Host: "bing.com"}
|
|
if err := decoder.Decode(option.ObfsOpts, obfsOption); err != nil {
|
|
return nil, fmt.Errorf("snell %s initialize obfs error: %w", addr, err)
|
|
}
|
|
|
|
if obfsOption.Mode != "tls" && obfsOption.Mode != "http" {
|
|
return nil, fmt.Errorf("snell %s obfs mode error: %s", addr, obfsOption.Mode)
|
|
}
|
|
|
|
// backward compatible
|
|
if option.Version == 0 {
|
|
option.Version = snell.DefaultSnellVersion
|
|
}
|
|
if option.Version != snell.Version1 && option.Version != snell.Version2 {
|
|
return nil, fmt.Errorf("snell version error: %d", option.Version)
|
|
}
|
|
|
|
s := &Snell{
|
|
Base: &Base{
|
|
name: option.Name,
|
|
addr: addr,
|
|
tp: C.Snell,
|
|
},
|
|
psk: psk,
|
|
obfsOption: obfsOption,
|
|
version: option.Version,
|
|
}
|
|
|
|
if option.Version == snell.Version2 {
|
|
s.pool = snell.NewPool(func(ctx context.Context) (*snell.Snell, error) {
|
|
c, err := dialer.DialContext(ctx, "tcp", addr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
tcpKeepAlive(c)
|
|
return streamConn(c, streamOption{psk, option.Version, addr, obfsOption}), nil
|
|
})
|
|
}
|
|
return s, nil
|
|
}
|