mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-10-04 09:46:14 -04:00
210 lines
6.1 KiB
Go
210 lines
6.1 KiB
Go
package shadowsocks
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import (
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"context"
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"time"
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core "github.com/v2fly/v2ray-core/v5"
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"github.com/v2fly/v2ray-core/v5/common"
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"github.com/v2fly/v2ray-core/v5/common/buf"
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"github.com/v2fly/v2ray-core/v5/common/net"
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"github.com/v2fly/v2ray-core/v5/common/net/packetaddr"
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"github.com/v2fly/v2ray-core/v5/common/protocol"
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"github.com/v2fly/v2ray-core/v5/common/retry"
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"github.com/v2fly/v2ray-core/v5/common/session"
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"github.com/v2fly/v2ray-core/v5/common/signal"
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"github.com/v2fly/v2ray-core/v5/common/task"
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"github.com/v2fly/v2ray-core/v5/features/policy"
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"github.com/v2fly/v2ray-core/v5/transport"
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"github.com/v2fly/v2ray-core/v5/transport/internet"
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"github.com/v2fly/v2ray-core/v5/transport/internet/udp"
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)
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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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policyManager policy.Manager
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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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s, err := protocol.NewServerSpecFromPB(rec)
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if err != nil {
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return nil, newError("failed to parse server spec").Base(err)
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}
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serverList.AddServer(s)
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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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v := core.MustFromContext(ctx)
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client := &Client{
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serverPicker: protocol.NewRoundRobinServerPicker(serverList),
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policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
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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 (c *Client) Process(ctx context.Context, link *transport.Link, dialer internet.Dialer) error {
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outbound := session.OutboundFromContext(ctx)
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if outbound == nil || !outbound.Target.IsValid() {
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return newError("target not specified")
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}
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destination := outbound.Target
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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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err := retry.ExponentialBackoff(5, 100).On(func() error {
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server = c.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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newError("tunneling request to ", destination, " via ", server.Destination()).WriteToLog(session.ExportIDToError(ctx))
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defer conn.Close()
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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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_, ok := user.Account.(*MemoryAccount)
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if !ok {
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return newError("user account is not valid")
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}
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request.User = user
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sessionPolicy := c.policyManager.ForLevel(user.Level)
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ctx, cancel := context.WithCancel(ctx)
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timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle)
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if packetConn, err := packetaddr.ToPacketAddrConn(link, destination); err == nil {
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requestDone := func() error {
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protocolWriter := &UDPWriter{
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Writer: conn,
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Request: request,
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}
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return udp.CopyPacketConn(protocolWriter, packetConn, udp.UpdateActivity(timer))
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}
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responseDone := func() error {
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protocolReader := &UDPReader{
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Reader: conn,
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User: user,
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}
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return udp.CopyPacketConn(packetConn, protocolReader, udp.UpdateActivity(timer))
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}
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responseDoneAndCloseWriter := task.OnSuccess(responseDone, task.Close(link.Writer))
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if err := task.Run(ctx, requestDone, responseDoneAndCloseWriter); 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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}
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if request.Command == protocol.RequestCommandTCP {
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requestDone := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
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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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if err = buf.CopyOnceTimeout(link.Reader, bodyWriter, time.Millisecond*100); err != nil && err != buf.ErrNotTimeoutReader && err != buf.ErrReadTimeout {
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return newError("failed to write A request payload").Base(err).AtWarning()
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}
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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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return buf.Copy(link.Reader, bodyWriter, buf.UpdateActivity(timer))
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}
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responseDone := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
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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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return buf.Copy(responseReader, link.Writer, buf.UpdateActivity(timer))
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}
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responseDoneAndCloseWriter := task.OnSuccess(responseDone, task.Close(link.Writer))
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if err := task.Run(ctx, requestDone, responseDoneAndCloseWriter); 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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}
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if request.Command == protocol.RequestCommandUDP {
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writer := &buf.SequentialWriter{Writer: &UDPWriter{
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Writer: conn,
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Request: request,
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}}
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requestDone := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
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if err := buf.Copy(link.Reader, writer, buf.UpdateActivity(timer)); err != nil {
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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 := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
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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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if err := buf.Copy(reader, link.Writer, buf.UpdateActivity(timer)); err != nil {
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return newError("failed to transport all UDP response").Base(err)
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}
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return nil
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}
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responseDoneAndCloseWriter := task.OnSuccess(responseDone, task.Close(link.Writer))
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if err := task.Run(ctx, requestDone, responseDoneAndCloseWriter); 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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}
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return nil
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}
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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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}
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