2016-10-31 10:24:28 -04:00
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package shadowsocks
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import (
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2017-01-12 18:56:21 -05:00
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"context"
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"time"
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2017-01-31 06:42:05 -05:00
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"v2ray.com/core/app/log"
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"v2ray.com/core/common"
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"v2ray.com/core/common/buf"
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"v2ray.com/core/common/net"
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"v2ray.com/core/common/protocol"
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"v2ray.com/core/common/retry"
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"v2ray.com/core/common/signal"
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"v2ray.com/core/proxy"
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"v2ray.com/core/transport/internet"
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"v2ray.com/core/transport/ray"
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)
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2016-12-21 17:07:35 -05:00
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// Client is a inbound handler for Shadowsocks protocol
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type Client struct {
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serverPicker protocol.ServerPicker
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}
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// NewClient create a new Shadowsocks client.
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func NewClient(ctx context.Context, config *ClientConfig) (*Client, error) {
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serverList := protocol.NewServerList()
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for _, rec := range config.Server {
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serverList.AddServer(protocol.NewServerSpecFromPB(*rec))
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}
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if serverList.Size() == 0 {
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return nil, newError("0 server")
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}
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client := &Client{
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serverPicker: protocol.NewRoundRobinServerPicker(serverList),
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}
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return client, nil
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}
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// Process implements OutboundHandler.Process().
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func (v *Client) Process(ctx context.Context, outboundRay ray.OutboundRay, dialer proxy.Dialer) error {
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destination, ok := proxy.TargetFromContext(ctx)
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if !ok {
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return newError("target not specified")
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}
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network := destination.Network
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var server *protocol.ServerSpec
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var conn internet.Connection
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2016-11-20 15:47:51 -05:00
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err := retry.ExponentialBackoff(5, 100).On(func() error {
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server = v.serverPicker.PickServer()
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dest := server.Destination()
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dest.Network = network
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rawConn, err := dialer.Dial(ctx, dest)
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if err != nil {
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return err
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}
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conn = rawConn
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return nil
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})
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if err != nil {
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return newError("failed to find an available destination").AtWarning().Base(err)
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}
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log.Trace(newError("tunneling request to ", destination, " via ", server.Destination()))
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defer conn.Close()
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2016-11-02 17:18:25 -04:00
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2016-10-31 11:35:18 -04:00
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request := &protocol.RequestHeader{
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Version: Version,
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Address: destination.Address,
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Port: destination.Port,
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}
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if destination.Network == net.Network_TCP {
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request.Command = protocol.RequestCommandTCP
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} else {
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request.Command = protocol.RequestCommandUDP
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}
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user := server.PickUser()
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rawAccount, err := user.GetTypedAccount()
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if err != nil {
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return newError("failed to get a valid user account").AtWarning().Base(err)
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}
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account := rawAccount.(*ShadowsocksAccount)
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request.User = user
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2016-11-02 11:17:57 -04:00
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if account.OneTimeAuth == Account_Auto || account.OneTimeAuth == Account_Enabled {
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request.Option |= RequestOptionOneTimeAuth
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}
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2017-11-14 18:36:14 -05:00
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ctx, cancel := context.WithCancel(ctx)
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timer := signal.CancelAfterInactivity(ctx, cancel, time.Minute*5)
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if request.Command == protocol.RequestCommandTCP {
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bufferedWriter := buf.NewBufferedWriter(buf.NewWriter(conn))
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bodyWriter, err := WriteTCPRequest(request, bufferedWriter)
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if err != nil {
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return newError("failed to write request").Base(err)
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}
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2017-03-27 05:26:44 -04:00
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if err := bufferedWriter.SetBuffered(false); err != nil {
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return err
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}
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2016-12-29 18:32:20 -05:00
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requestDone := signal.ExecuteAsync(func() error {
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if err := buf.Copy(outboundRay.OutboundInput(), bodyWriter, buf.UpdateActivity(timer)); err != nil {
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return err
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}
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return nil
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})
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2016-12-29 18:32:20 -05:00
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responseDone := signal.ExecuteAsync(func() error {
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defer outboundRay.OutboundOutput().Close()
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responseReader, err := ReadTCPResponse(user, conn)
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if err != nil {
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return err
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}
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2017-04-27 16:30:48 -04:00
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if err := buf.Copy(responseReader, outboundRay.OutboundOutput(), buf.UpdateActivity(timer)); err != nil {
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2016-12-29 18:32:20 -05:00
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return err
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2016-11-21 17:06:26 -05:00
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}
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2016-12-29 18:32:20 -05:00
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return nil
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})
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2016-11-04 20:00:09 -04:00
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2017-01-28 15:24:46 -05:00
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if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil {
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return newError("connection ends").Base(err)
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}
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return nil
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2016-10-31 11:35:18 -04:00
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}
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if request.Command == protocol.RequestCommandUDP {
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2017-04-21 08:51:09 -04:00
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writer := buf.NewSequentialWriter(&UDPWriter{
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Writer: conn,
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Request: request,
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})
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2016-11-04 20:00:09 -04:00
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2016-12-29 18:32:20 -05:00
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requestDone := signal.ExecuteAsync(func() error {
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if err := buf.Copy(outboundRay.OutboundInput(), writer, buf.UpdateActivity(timer)); err != nil {
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2017-04-08 18:54:23 -04:00
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return newError("failed to transport all UDP request").Base(err)
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}
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return nil
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})
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responseDone := signal.ExecuteAsync(func() error {
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defer outboundRay.OutboundOutput().Close()
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reader := &UDPReader{
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Reader: conn,
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User: user,
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}
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2017-04-27 16:30:48 -04:00
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if err := buf.Copy(reader, outboundRay.OutboundOutput(), buf.UpdateActivity(timer)); err != nil {
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2017-04-08 18:54:23 -04:00
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return newError("failed to transport all UDP response").Base(err)
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2016-12-29 18:32:20 -05:00
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}
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return nil
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})
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2017-01-28 15:24:46 -05:00
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if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil {
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return newError("connection ends").Base(err)
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2017-01-10 08:22:42 -05:00
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}
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2017-01-26 14:46:44 -05:00
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return nil
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2016-10-31 11:35:18 -04:00
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}
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2017-01-26 14:46:44 -05:00
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return nil
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2016-10-31 10:24:28 -04:00
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}
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2016-11-02 11:33:04 -04:00
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2017-01-12 18:56:21 -05:00
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func init() {
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common.Must(common.RegisterConfig((*ClientConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
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return NewClient(ctx, config.(*ClientConfig))
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}))
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2016-11-02 11:33:04 -04:00
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}
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