Xray-core/proxy/shadowsocks/client.go
yuhan6665 079d0bd8a9
Refactor log (#3446)
* Refactor log

* Add new log methods

* Fix logger test

* Change all logging code

* Clean up pathObj

* Rebase to latest main

* Remove invoking method name after the dot
2024-06-29 14:32:57 -04:00

207 lines
5.6 KiB
Go

package shadowsocks
import (
"context"
"time"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/buf"
"github.com/xtls/xray-core/common/errors"
"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"
)
// Client is a inbound handler for Shadowsocks protocol
type Client struct {
serverPicker protocol.ServerPicker
policyManager policy.Manager
}
// NewClient create a new Shadowsocks client.
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 parse server spec").Base(err)
}
serverList.AddServer(s)
}
if serverList.Size() == 0 {
return nil, errors.New("0 server")
}
v := core.MustFromContext(ctx)
client := &Client{
serverPicker: protocol.NewRoundRobinServerPicker(serverList),
policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
}
return client, nil
}
// Process implements OutboundHandler.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")
}
ob.Name = "shadowsocks"
ob.CanSpliceCopy = 3
destination := ob.Target
network := destination.Network
var server *protocol.ServerSpec
var conn stat.Connection
err := retry.ExponentialBackoff(5, 100).On(func() error {
server = c.serverPicker.PickServer()
dest := server.Destination()
dest.Network = network
rawConn, err := dialer.Dial(ctx, dest)
if err != nil {
return err
}
conn = rawConn
return nil
})
if err != nil {
return errors.New("failed to find an available destination").AtWarning().Base(err)
}
errors.LogInfo(ctx, "tunneling request to ", destination, " via ", network, ":", server.Destination().NetAddr())
defer conn.Close()
request := &protocol.RequestHeader{
Version: Version,
Address: destination.Address,
Port: destination.Port,
}
if destination.Network == net.Network_TCP {
request.Command = protocol.RequestCommandTCP
} else {
request.Command = protocol.RequestCommandUDP
}
user := server.PickUser()
_, ok := user.Account.(*MemoryAccount)
if !ok {
return errors.New("user account is not valid")
}
request.User = user
var newCtx context.Context
var newCancel context.CancelFunc
if session.TimeoutOnlyFromContext(ctx) {
newCtx, newCancel = context.WithCancel(context.Background())
}
sessionPolicy := c.policyManager.ForLevel(user.Level)
ctx, cancel := context.WithCancel(ctx)
timer := signal.CancelAfterInactivity(ctx, func() {
cancel()
if newCancel != nil {
newCancel()
}
}, sessionPolicy.Timeouts.ConnectionIdle)
if newCtx != nil {
ctx = newCtx
}
if request.Command == protocol.RequestCommandTCP {
requestDone := func() error {
defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
bufferedWriter := buf.NewBufferedWriter(buf.NewWriter(conn))
bodyWriter, err := WriteTCPRequest(request, bufferedWriter)
if err != nil {
return errors.New("failed to write request").Base(err)
}
if err = buf.CopyOnceTimeout(link.Reader, bodyWriter, time.Millisecond*100); err != nil && err != buf.ErrNotTimeoutReader && err != buf.ErrReadTimeout {
return errors.New("failed to write A request payload").Base(err).AtWarning()
}
if err := bufferedWriter.SetBuffered(false); err != nil {
return err
}
return buf.Copy(link.Reader, bodyWriter, buf.UpdateActivity(timer))
}
responseDone := func() error {
defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
responseReader, err := ReadTCPResponse(user, conn)
if err != nil {
return err
}
return buf.Copy(responseReader, link.Writer, buf.UpdateActivity(timer))
}
responseDoneAndCloseWriter := task.OnSuccess(responseDone, task.Close(link.Writer))
if err := task.Run(ctx, requestDone, responseDoneAndCloseWriter); err != nil {
return errors.New("connection ends").Base(err)
}
return nil
}
if request.Command == protocol.RequestCommandUDP {
requestDone := func() error {
defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
writer := &UDPWriter{
Writer: conn,
Request: request,
}
if err := buf.Copy(link.Reader, writer, buf.UpdateActivity(timer)); err != nil {
return errors.New("failed to transport all UDP request").Base(err)
}
return nil
}
responseDone := func() error {
defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
reader := &UDPReader{
Reader: conn,
User: user,
}
if err := buf.Copy(reader, link.Writer, buf.UpdateActivity(timer)); err != nil {
return errors.New("failed to transport all UDP response").Base(err)
}
return nil
}
responseDoneAndCloseWriter := task.OnSuccess(responseDone, task.Close(link.Writer))
if err := task.Run(ctx, requestDone, responseDoneAndCloseWriter); err != nil {
return errors.New("connection ends").Base(err)
}
return nil
}
return nil
}
func init() {
common.Must(common.RegisterConfig((*ClientConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return NewClient(ctx, config.(*ClientConfig))
}))
}