mirror of https://github.com/v2ray/v2ray-core
131 lines
3.4 KiB
Go
131 lines
3.4 KiB
Go
package socks
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import (
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"context"
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"runtime"
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"time"
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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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// Client is a Socks5 client.
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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 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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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 target server")
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}
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return &Client{
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serverPicker: protocol.NewRoundRobinServerPicker(serverList),
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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, ray 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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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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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").Base(err)
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}
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defer conn.Close()
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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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}
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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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ctx, timer := signal.CancelAfterInactivity(ctx, time.Minute*2)
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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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return buf.Copy(timer, ray.OutboundInput(), buf.NewWriter(conn))
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}
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responseFunc = func() error {
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defer ray.OutboundOutput().Close()
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return buf.Copy(timer, buf.NewReader(conn), ray.OutboundOutput())
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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()
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requestFunc = func() error {
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return buf.Copy(timer, ray.OutboundInput(), &UDPWriter{request: request, writer: udpConn})
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}
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responseFunc = func() error {
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defer ray.OutboundOutput().Close()
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reader := &UDPReader{reader: udpConn}
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return buf.Copy(timer, reader, ray.OutboundOutput())
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}
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}
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requestDone := signal.ExecuteAsync(requestFunc)
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responseDone := signal.ExecuteAsync(responseFunc)
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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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runtime.KeepAlive(timer)
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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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