78 lines
2.1 KiB
Go
78 lines
2.1 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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obfsOption *simpleObfsOption
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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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ObfsOpts map[string]interface{} `proxy:"obfs-opts,omitempty"`
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}
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func (s *Snell) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
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switch s.obfsOption.Mode {
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case "tls":
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c = obfs.NewTLSObfs(c, s.obfsOption.Host)
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case "http":
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_, port, _ := net.SplitHostPort(s.addr)
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c = obfs.NewHTTPObfs(c, s.obfsOption.Host, port)
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}
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c = snell.StreamConn(c, s.psk)
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port, _ := strconv.Atoi(metadata.DstPort)
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err := snell.WriteHeader(c, metadata.String(), uint(port))
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return c, err
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}
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func (s *Snell) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
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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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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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if obfsOption.Mode != "tls" && obfsOption.Mode != "http" {
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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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return &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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}, nil
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}
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