Xray-core/proxy/socks/client.go

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package socks
import (
"context"
"time"
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"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/buf"
"github.com/xtls/xray-core/common/errors"
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"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/protocol"
"github.com/xtls/xray-core/common/retry"
"github.com/xtls/xray-core/common/session"
"github.com/xtls/xray-core/common/signal"
"github.com/xtls/xray-core/common/task"
"github.com/xtls/xray-core/core"
"github.com/xtls/xray-core/features/policy"
"github.com/xtls/xray-core/transport"
"github.com/xtls/xray-core/transport/internet"
"github.com/xtls/xray-core/transport/internet/stat"
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)
// Client is a Socks5 client.
type Client struct {
serverPicker protocol.ServerPicker
policyManager policy.Manager
}
// NewClient create a new Socks5 client based on the given config.
func NewClient(ctx context.Context, config *ClientConfig) (*Client, error) {
serverList := protocol.NewServerList()
for _, rec := range config.Server {
s, err := protocol.NewServerSpecFromPB(rec)
if err != nil {
return nil, errors.New("failed to get server spec").Base(err)
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}
serverList.AddServer(s)
}
if serverList.Size() == 0 {
return nil, errors.New("0 target server")
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}
v := core.MustFromContext(ctx)
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c := &Client{
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serverPicker: protocol.NewRoundRobinServerPicker(serverList),
policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
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}
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return c, nil
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}
// Process implements proxy.Outbound.Process.
func (c *Client) Process(ctx context.Context, link *transport.Link, dialer internet.Dialer) error {
outbounds := session.OutboundsFromContext(ctx)
ob := outbounds[len(outbounds)-1]
if !ob.Target.IsValid() {
return errors.New("target not specified.")
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}
ob.Name = "socks"
ob.CanSpliceCopy = 2
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// Destination of the inner request.
destination := ob.Target
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// Outbound server.
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var server *protocol.ServerSpec
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// Outbound server's destination.
var dest net.Destination
// Connection to the outbound server.
var conn stat.Connection
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if err := retry.ExponentialBackoff(5, 100).On(func() error {
server = c.serverPicker.PickServer()
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dest = server.Destination()
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rawConn, err := dialer.Dial(ctx, dest)
if err != nil {
return err
}
conn = rawConn
return nil
}); err != nil {
return errors.New("failed to find an available destination").Base(err)
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}
defer func() {
if err := conn.Close(); err != nil {
errors.LogInfoInner(ctx, err, "failed to closed connection")
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}
}()
p := c.policyManager.ForLevel(0)
request := &protocol.RequestHeader{
Version: socks5Version,
Command: protocol.RequestCommandTCP,
Address: destination.Address,
Port: destination.Port,
}
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if destination.Network == net.Network_UDP {
request.Command = protocol.RequestCommandUDP
}
user := server.PickUser()
if user != nil {
request.User = user
p = c.policyManager.ForLevel(user.Level)
}
if err := conn.SetDeadline(time.Now().Add(p.Timeouts.Handshake)); err != nil {
errors.LogInfoInner(ctx, err, "failed to set deadline for handshake")
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}
udpRequest, err := ClientHandshake(request, conn, conn)
if err != nil {
return errors.New("failed to establish connection to server").AtWarning().Base(err)
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}
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if udpRequest != nil {
if udpRequest.Address == net.AnyIP || udpRequest.Address == net.AnyIPv6 {
udpRequest.Address = dest.Address
}
}
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if err := conn.SetDeadline(time.Time{}); err != nil {
errors.LogInfoInner(ctx, err, "failed to clear deadline after handshake")
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}
var newCtx context.Context
var newCancel context.CancelFunc
if session.TimeoutOnlyFromContext(ctx) {
newCtx, newCancel = context.WithCancel(context.Background())
}
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ctx, cancel := context.WithCancel(ctx)
timer := signal.CancelAfterInactivity(ctx, func() {
cancel()
if newCancel != nil {
newCancel()
}
}, p.Timeouts.ConnectionIdle)
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var requestFunc func() error
var responseFunc func() error
if request.Command == protocol.RequestCommandTCP {
requestFunc = func() error {
defer timer.SetTimeout(p.Timeouts.DownlinkOnly)
return buf.Copy(link.Reader, buf.NewWriter(conn), buf.UpdateActivity(timer))
}
responseFunc = func() error {
defer timer.SetTimeout(p.Timeouts.UplinkOnly)
return buf.Copy(buf.NewReader(conn), link.Writer, buf.UpdateActivity(timer))
}
} else if request.Command == protocol.RequestCommandUDP {
udpConn, err := dialer.Dial(ctx, udpRequest.Destination())
if err != nil {
return errors.New("failed to create UDP connection").Base(err)
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}
defer udpConn.Close()
requestFunc = func() error {
defer timer.SetTimeout(p.Timeouts.DownlinkOnly)
writer := &UDPWriter{Writer: udpConn, Request: request}
return buf.Copy(link.Reader, writer, buf.UpdateActivity(timer))
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}
responseFunc = func() error {
defer timer.SetTimeout(p.Timeouts.UplinkOnly)
reader := &UDPReader{Reader: udpConn}
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return buf.Copy(reader, link.Writer, buf.UpdateActivity(timer))
}
}
if newCtx != nil {
ctx = newCtx
}
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responseDonePost := task.OnSuccess(responseFunc, task.Close(link.Writer))
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if err := task.Run(ctx, requestFunc, responseDonePost); err != nil {
return errors.New("connection ends").Base(err)
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}
return nil
}
func init() {
common.Must(common.RegisterConfig((*ClientConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return NewClient(ctx, config.(*ClientConfig))
}))
}