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