clash/adapters/outbound/shadowsocks.go
2021-04-29 11:23:14 +08:00

210 lines
5.6 KiB
Go

package outbound
import (
"context"
"encoding/json"
"errors"
"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/socks5"
v2rayObfs "github.com/Dreamacro/clash/component/v2ray-plugin"
C "github.com/Dreamacro/clash/constant"
"github.com/Dreamacro/go-shadowsocks2/core"
)
type ShadowSocks struct {
*Base
cipher core.Cipher
// obfs
obfsMode string
obfsOption *simpleObfsOption
v2rayOption *v2rayObfs.Option
}
type ShadowSocksOption struct {
Name string `proxy:"name"`
Server string `proxy:"server"`
Port int `proxy:"port"`
Password string `proxy:"password"`
Cipher string `proxy:"cipher"`
UDP bool `proxy:"udp,omitempty"`
Plugin string `proxy:"plugin,omitempty"`
PluginOpts map[string]interface{} `proxy:"plugin-opts,omitempty"`
}
type simpleObfsOption struct {
Mode string `obfs:"mode,omitempty"`
Host string `obfs:"host,omitempty"`
}
type v2rayObfsOption struct {
Mode string `obfs:"mode"`
Host string `obfs:"host,omitempty"`
Path string `obfs:"path,omitempty"`
TLS bool `obfs:"tls,omitempty"`
Headers map[string]string `obfs:"headers,omitempty"`
SkipCertVerify bool `obfs:"skip-cert-verify,omitempty"`
Mux bool `obfs:"mux,omitempty"`
}
// StreamConn implements C.ProxyAdapter
func (ss *ShadowSocks) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
switch ss.obfsMode {
case "tls":
c = obfs.NewTLSObfs(c, ss.obfsOption.Host)
case "http":
_, port, _ := net.SplitHostPort(ss.addr)
c = obfs.NewHTTPObfs(c, ss.obfsOption.Host, port)
case "websocket":
var err error
c, err = v2rayObfs.NewV2rayObfs(c, ss.v2rayOption)
if err != nil {
return nil, fmt.Errorf("%s connect error: %w", ss.addr, err)
}
}
c = ss.cipher.StreamConn(c)
_, err := c.Write(serializesSocksAddr(metadata))
return c, err
}
// DialContext implements C.ProxyAdapter
func (ss *ShadowSocks) DialContext(ctx context.Context, metadata *C.Metadata) (_ C.Conn, err error) {
c, err := dialer.DialContext(ctx, "tcp", ss.addr)
if err != nil {
return nil, fmt.Errorf("%s connect error: %w", ss.addr, err)
}
tcpKeepAlive(c)
defer safeConnClose(c, err)
c, err = ss.StreamConn(c, metadata)
return NewConn(c, ss), err
}
// DialUDP implements C.ProxyAdapter
func (ss *ShadowSocks) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
pc, err := dialer.ListenPacket("udp", "")
if err != nil {
return nil, err
}
addr, err := resolveUDPAddr("udp", ss.addr)
if err != nil {
pc.Close()
return nil, err
}
pc = ss.cipher.PacketConn(pc)
return newPacketConn(&ssPacketConn{PacketConn: pc, rAddr: addr}, ss), nil
}
// MarshalJSON implements C.ProxyAdapter
func (ss *ShadowSocks) MarshalJSON() ([]byte, error) {
return json.Marshal(map[string]string{
"type": ss.Type().String(),
})
}
func NewShadowSocks(option ShadowSocksOption) (*ShadowSocks, error) {
addr := net.JoinHostPort(option.Server, strconv.Itoa(option.Port))
cipher := option.Cipher
password := option.Password
ciph, err := core.PickCipher(cipher, nil, password)
if err != nil {
return nil, fmt.Errorf("ss %s initialize error: %w", addr, err)
}
var v2rayOption *v2rayObfs.Option
var obfsOption *simpleObfsOption
obfsMode := ""
decoder := structure.NewDecoder(structure.Option{TagName: "obfs", WeaklyTypedInput: true})
if option.Plugin == "obfs" {
opts := simpleObfsOption{Host: "bing.com"}
if err := decoder.Decode(option.PluginOpts, &opts); err != nil {
return nil, fmt.Errorf("ss %s initialize obfs error: %w", addr, err)
}
if opts.Mode != "tls" && opts.Mode != "http" {
return nil, fmt.Errorf("ss %s obfs mode error: %s", addr, opts.Mode)
}
obfsMode = opts.Mode
obfsOption = &opts
} else if option.Plugin == "v2ray-plugin" {
opts := v2rayObfsOption{Host: "bing.com", Mux: true}
if err := decoder.Decode(option.PluginOpts, &opts); err != nil {
return nil, fmt.Errorf("ss %s initialize v2ray-plugin error: %w", addr, err)
}
if opts.Mode != "websocket" {
return nil, fmt.Errorf("ss %s obfs mode error: %s", addr, opts.Mode)
}
obfsMode = opts.Mode
v2rayOption = &v2rayObfs.Option{
Host: opts.Host,
Path: opts.Path,
Headers: opts.Headers,
Mux: opts.Mux,
}
if opts.TLS {
v2rayOption.TLS = true
v2rayOption.SkipCertVerify = opts.SkipCertVerify
v2rayOption.SessionCache = getClientSessionCache()
}
}
return &ShadowSocks{
Base: &Base{
name: option.Name,
addr: addr,
tp: C.Shadowsocks,
udp: option.UDP,
},
cipher: ciph,
obfsMode: obfsMode,
v2rayOption: v2rayOption,
obfsOption: obfsOption,
}, nil
}
type ssPacketConn struct {
net.PacketConn
rAddr net.Addr
}
func (spc *ssPacketConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
packet, err := socks5.EncodeUDPPacket(socks5.ParseAddrToSocksAddr(addr), b)
if err != nil {
return
}
return spc.PacketConn.WriteTo(packet[3:], spc.rAddr)
}
func (spc *ssPacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
n, _, e := spc.PacketConn.ReadFrom(b)
if e != nil {
return 0, nil, e
}
addr := socks5.SplitAddr(b[:n])
if addr == nil {
return 0, nil, errors.New("parse addr error")
}
udpAddr := addr.UDPAddr()
if udpAddr == nil {
return 0, nil, errors.New("parse addr error")
}
copy(b, b[len(addr):])
return n - len(addr), udpAddr, e
}