package shadowsocks_2022 import ( "context" "io" "runtime" "time" "github.com/sagernet/sing-shadowsocks" "github.com/sagernet/sing-shadowsocks/shadowaead_2022" C "github.com/sagernet/sing/common" B "github.com/sagernet/sing/common/buf" "github.com/sagernet/sing/common/bufio" N "github.com/sagernet/sing/common/network" "github.com/xtls/xray-core/common" "github.com/xtls/xray-core/common/buf" "github.com/xtls/xray-core/common/net" "github.com/xtls/xray-core/common/session" "github.com/xtls/xray-core/transport" "github.com/xtls/xray-core/transport/internet" ) func init() { common.Must(common.RegisterConfig((*ClientConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) { return NewClient(ctx, config.(*ClientConfig)) })) } type Outbound struct { ctx context.Context server net.Destination method shadowsocks.Method } func NewClient(ctx context.Context, config *ClientConfig) (*Outbound, error) { o := &Outbound{ ctx: ctx, server: net.Destination{ Address: config.Address.AsAddress(), Port: net.Port(config.Port), Network: net.Network_TCP, }, } if C.Contains(shadowaead_2022.List, config.Method) { if config.Key == "" { return nil, newError("missing psk") } method, err := shadowaead_2022.NewWithPassword(config.Method, config.Key) if err != nil { return nil, newError("create method").Base(err) } o.method = method } else { return nil, newError("unknown method ", config.Method) } return o, nil } func (o *Outbound) Process(ctx context.Context, link *transport.Link, dialer internet.Dialer) error { var inboundConn net.Conn inbound := session.InboundFromContext(ctx) if inbound != nil { inboundConn = inbound.Conn } outbound := session.OutboundFromContext(ctx) if outbound == nil || !outbound.Target.IsValid() { return newError("target not specified") } destination := outbound.Target network := destination.Network newError("tunneling request to ", destination, " via ", o.server.NetAddr()).WriteToLog(session.ExportIDToError(ctx)) serverDestination := o.server serverDestination.Network = network connection, err := dialer.Dial(ctx, serverDestination) if err != nil { return newError("failed to connect to server").Base(err) } if network == net.Network_TCP { serverConn := o.method.DialEarlyConn(connection, toSocksaddr(destination)) var handshake bool if timeoutReader, isTimeoutReader := link.Reader.(buf.TimeoutReader); isTimeoutReader { mb, err := timeoutReader.ReadMultiBufferTimeout(time.Millisecond * 100) if err != nil && err != buf.ErrNotTimeoutReader && err != buf.ErrReadTimeout { return newError("read payload").Base(err) } _payload := B.StackNew() payload := C.Dup(_payload) defer payload.Release() for { payload.FullReset() nb, n := buf.SplitBytes(mb, payload.FreeBytes()) if n > 0 { payload.Truncate(n) _, err = serverConn.Write(payload.Bytes()) if err != nil { return newError("write payload").Base(err) } handshake = true } if nb.IsEmpty() { break } else { mb = nb } } runtime.KeepAlive(_payload) } if !handshake { _, err = serverConn.Write(nil) if err != nil { return newError("client handshake").Base(err) } } conn := &pipeConnWrapper{ W: link.Writer, Conn: inboundConn, } if ir, ok := link.Reader.(io.Reader); ok { conn.R = ir } else { conn.R = &buf.BufferedReader{Reader: link.Reader} } return returnError(bufio.CopyConn(ctx, conn, serverConn)) } else { var packetConn N.PacketConn if pc, isPacketConn := inboundConn.(N.PacketConn); isPacketConn { packetConn = pc } else if nc, isNetPacket := inboundConn.(net.PacketConn); isNetPacket { packetConn = &bufio.PacketConnWrapper{PacketConn: nc} } else { packetConn = &packetConnWrapper{ Reader: link.Reader, Writer: link.Writer, Conn: inboundConn, Dest: destination, } } serverConn := o.method.DialPacketConn(connection) return returnError(bufio.CopyPacketConn(ctx, packetConn, serverConn)) } }