mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-08-30 08:14:27 -04:00
153 lines
4.5 KiB
Go
153 lines
4.5 KiB
Go
package socks
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import (
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"context"
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"time"
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"v2ray.com/core"
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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/session"
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"v2ray.com/core/common/signal"
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"v2ray.com/core/common/task"
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"v2ray.com/core/common/vio"
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"v2ray.com/core/features/policy"
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"v2ray.com/core/transport/internet"
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)
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// Client is a Socks5 client.
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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 Socks5 client based on the given config.
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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 get 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 target server")
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}
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v := core.MustFromContext(ctx)
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return &Client{
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serverPicker: protocol.NewRoundRobinServerPicker(serverList),
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policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
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}, nil
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}
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// Process implements proxy.Outbound.Process.
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func (c *Client) Process(ctx context.Context, link *vio.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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var server *protocol.ServerSpec
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var conn internet.Connection
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if 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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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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}); err != nil {
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return newError("failed to find an available destination").Base(err)
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}
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defer func() {
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if err := conn.Close(); err != nil {
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newError("failed to closed connection").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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}()
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p := c.policyManager.ForLevel(0)
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request := &protocol.RequestHeader{
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Version: socks5Version,
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Command: protocol.RequestCommandTCP,
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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_UDP {
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request.Command = protocol.RequestCommandUDP
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}
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user := server.PickUser()
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if user != nil {
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request.User = user
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p = c.policyManager.ForLevel(user.Level)
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}
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if err := conn.SetDeadline(time.Now().Add(p.Timeouts.Handshake)); err != nil {
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newError("failed to set deadline for handshake").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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udpRequest, err := ClientHandshake(request, conn, conn)
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if err != nil {
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return newError("failed to establish connection to server").AtWarning().Base(err)
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}
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if err := conn.SetDeadline(time.Time{}); err != nil {
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newError("failed to clear deadline after handshake").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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ctx, cancel := context.WithCancel(ctx)
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timer := signal.CancelAfterInactivity(ctx, cancel, p.Timeouts.ConnectionIdle)
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var requestFunc func() error
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var responseFunc func() error
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if request.Command == protocol.RequestCommandTCP {
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requestFunc = func() error {
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defer timer.SetTimeout(p.Timeouts.DownlinkOnly)
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return buf.Copy(link.Reader, buf.NewWriter(conn), buf.UpdateActivity(timer))
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}
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responseFunc = func() error {
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defer timer.SetTimeout(p.Timeouts.UplinkOnly)
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return buf.Copy(buf.NewReader(conn), link.Writer, buf.UpdateActivity(timer))
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}
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} else if request.Command == protocol.RequestCommandUDP {
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udpConn, err := dialer.Dial(ctx, udpRequest.Destination())
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if err != nil {
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return newError("failed to create UDP connection").Base(err)
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}
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defer udpConn.Close() // nolint: errcheck
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requestFunc = func() error {
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defer timer.SetTimeout(p.Timeouts.DownlinkOnly)
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return buf.Copy(link.Reader, &buf.SequentialWriter{Writer: NewUDPWriter(request, udpConn)}, buf.UpdateActivity(timer))
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}
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responseFunc = func() error {
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defer timer.SetTimeout(p.Timeouts.UplinkOnly)
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reader := &UDPReader{reader: udpConn}
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return buf.Copy(reader, link.Writer, buf.UpdateActivity(timer))
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}
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}
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var responseDonePost = task.Single(responseFunc, task.OnSuccess(task.Close(link.Writer)))
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if err := task.Run(task.WithContext(ctx), task.Parallel(requestFunc, responseDonePost))(); 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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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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