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mirror of https://github.com/v2fly/v2ray-core.git synced 2024-12-23 02:26:49 -05:00
v2fly/proxy/shadowsocks2022/client.go
Xiaokang Wang (Shelikhoo) b6da3e86a5
Shadowsocks2022 Client Implementation Improvements (#2770)
* Shadowsocks2022 Client Implementation Improvements

1. Added UDP Replay Detection
2. Added UDP Processor State Cache
3. Added More Detailed Output for Time Difference Error
4. Replaced Mutex with RWMutex for reduced lock contention
5. Added per server session tracking of decryption cache and anti-replay window
6. Adjust server session track time
7. Increase per session buffer to 128
8. Fix client crash when EIH is not enabled
9. Fix client log contains non-human-friendly content
10.Remove mark and remove for trackedSessions
11. Fixed packet size uint16 overflow issue
2023-11-24 00:40:07 +00:00

248 lines
8.3 KiB
Go

package shadowsocks2022
import (
"context"
gonet "net"
"sync"
"time"
"github.com/v2fly/v2ray-core/v5/common"
"github.com/v2fly/v2ray-core/v5/common/buf"
"github.com/v2fly/v2ray-core/v5/common/environment"
"github.com/v2fly/v2ray-core/v5/common/environment/envctx"
"github.com/v2fly/v2ray-core/v5/common/net"
"github.com/v2fly/v2ray-core/v5/common/net/packetaddr"
"github.com/v2fly/v2ray-core/v5/common/retry"
"github.com/v2fly/v2ray-core/v5/common/session"
"github.com/v2fly/v2ray-core/v5/common/signal"
"github.com/v2fly/v2ray-core/v5/common/task"
"github.com/v2fly/v2ray-core/v5/transport"
"github.com/v2fly/v2ray-core/v5/transport/internet"
"github.com/v2fly/v2ray-core/v5/transport/internet/udp"
)
type Client struct {
config *ClientConfig
ctx context.Context
}
const UDPConnectionState = "UDPConnectionState"
type ClientUDPConnState struct {
session *ClientUDPSession
initOnce *sync.Once
}
func (c *ClientUDPConnState) GetOrCreateSession(create func() (*ClientUDPSession, error)) (*ClientUDPSession, error) {
var errOuter error
c.initOnce.Do(func() {
sessionState, err := create()
if err != nil {
errOuter = newError("failed to create UDP session").Base(err)
return
}
c.session = sessionState
})
if errOuter != nil {
return nil, newError("failed to initialize UDP State").Base(errOuter)
}
return c.session, nil
}
func NewClientUDPConnState() (*ClientUDPConnState, error) {
return &ClientUDPConnState{initOnce: &sync.Once{}}, nil
}
func (c *Client) Process(ctx context.Context, link *transport.Link, dialer internet.Dialer) error {
outbound := session.OutboundFromContext(ctx)
if outbound == nil || !outbound.Target.IsValid() {
return newError("target not specified")
}
destination := outbound.Target
network := destination.Network
keyDerivation := newBLAKE3KeyDerivation()
var method Method
switch c.config.Method {
case "2022-blake3-aes-128-gcm":
method = newAES128GCMMethod()
case "2022-blake3-aes-256-gcm":
method = newAES256GCMMethod()
default:
return newError("unknown method: ", c.config.Method)
}
effectivePsk := c.config.Psk
ctx, cancel := context.WithCancel(ctx)
timer := signal.CancelAfterInactivity(ctx, cancel, time.Minute)
if packetConn, err := packetaddr.ToPacketAddrConn(link, destination); err == nil {
udpSession, err := c.getUDPSession(c.ctx, network, dialer, method, keyDerivation)
if err != nil {
return newError("failed to get UDP udpSession").Base(err)
}
requestDone := func() error {
return udp.CopyPacketConn(udpSession, packetConn, udp.UpdateActivity(timer))
}
responseDone := func() error {
return udp.CopyPacketConn(packetConn, udpSession, udp.UpdateActivity(timer))
}
responseDoneAndCloseWriter := task.OnSuccess(responseDone, task.Close(link.Writer))
if err := task.Run(ctx, requestDone, responseDoneAndCloseWriter); err != nil {
return newError("connection ends").Base(err)
}
return nil
}
if network == net.Network_TCP {
var conn internet.Connection
err := retry.ExponentialBackoff(5, 100).On(func() error {
dest := net.TCPDestination(c.config.Address.AsAddress(), net.Port(c.config.Port))
dest.Network = network
rawConn, err := dialer.Dial(ctx, dest)
if err != nil {
return err
}
conn = rawConn
return nil
})
if err != nil {
return newError("failed to find an available destination").AtWarning().Base(err)
}
newError("tunneling request to ", destination, " via ", network, ":", net.TCPDestination(c.config.Address.AsAddress(), net.Port(c.config.Port)).NetAddr()).WriteToLog(session.ExportIDToError(ctx))
defer conn.Close()
request := &TCPRequest{
keyDerivation: keyDerivation,
method: method,
}
TCPRequestBuffer := buf.New()
defer TCPRequestBuffer.Release()
err = request.EncodeTCPRequestHeader(effectivePsk, c.config.Ipsk, destination.Address,
int(destination.Port), nil, TCPRequestBuffer)
if err != nil {
return newError("failed to encode TCP request header").Base(err)
}
_, err = conn.Write(TCPRequestBuffer.Bytes())
if err != nil {
return newError("failed to write TCP request header").Base(err)
}
requestDone := func() error {
encodedWriter := request.CreateClientC2SWriter(conn)
return buf.Copy(link.Reader, encodedWriter, buf.UpdateActivity(timer))
}
responseDone := func() error {
err = request.DecodeTCPResponseHeader(effectivePsk, conn)
if err != nil {
return newError("failed to decode TCP response header").Base(err)
}
if err = request.CheckC2SConnectionConstraint(); err != nil {
return newError("C2S connection constraint violation").Base(err)
}
initialPayload := buf.NewWithSize(65535)
encodedReader, err := request.CreateClientS2CReader(conn, initialPayload)
if err != nil {
return newError("failed to create client S2C reader").Base(err)
}
err = link.Writer.WriteMultiBuffer(buf.MultiBuffer{initialPayload})
if err != nil {
return newError("failed to write initial payload").Base(err)
}
return buf.Copy(encodedReader, link.Writer, buf.UpdateActivity(timer))
}
responseDoneAndCloseWriter := task.OnSuccess(responseDone, task.Close(link.Writer))
if err := task.Run(ctx, requestDone, responseDoneAndCloseWriter); err != nil {
return newError("connection ends").Base(err)
}
return nil
} else {
udpSession, err := c.getUDPSession(c.ctx, network, dialer, method, keyDerivation)
if err != nil {
return newError("failed to get UDP udpSession").Base(err)
}
monoDestUDPConn := udp.NewMonoDestUDPConn(udpSession, &gonet.UDPAddr{IP: destination.Address.IP(), Port: int(destination.Port)})
requestDone := func() error {
return buf.Copy(link.Reader, monoDestUDPConn, buf.UpdateActivity(timer))
}
responseDone := func() error {
return buf.Copy(monoDestUDPConn, link.Writer, buf.UpdateActivity(timer))
}
responseDoneAndCloseWriter := task.OnSuccess(responseDone, task.Close(link.Writer))
if err := task.Run(ctx, requestDone, responseDoneAndCloseWriter); err != nil {
return newError("connection ends").Base(err)
}
return nil
}
}
func (c *Client) getUDPSession(ctx context.Context, network net.Network, dialer internet.Dialer, method Method, keyDerivation *BLAKE3KeyDerivation) (internet.AbstractPacketConn, error) {
storage := envctx.EnvironmentFromContext(ctx).(environment.ProxyEnvironment).TransientStorage()
clientUDPStateIfce, err := storage.Get(ctx, UDPConnectionState)
if err != nil {
return nil, newError("failed to get UDP connection state").Base(err)
}
clientUDPState, ok := clientUDPStateIfce.(*ClientUDPConnState)
if !ok {
return nil, newError("failed to cast UDP connection state")
}
sessionState, err := clientUDPState.GetOrCreateSession(func() (*ClientUDPSession, error) {
var conn internet.Connection
err := retry.ExponentialBackoff(5, 100).On(func() error {
dest := net.TCPDestination(c.config.Address.AsAddress(), net.Port(c.config.Port))
dest.Network = network
rawConn, err := dialer.Dial(ctx, dest)
if err != nil {
return err
}
conn = rawConn
return nil
})
if err != nil {
return nil, newError("failed to find an available destination").AtWarning().Base(err)
}
newError("creating udp session to ", network, ":", c.config.Address).WriteToLog(session.ExportIDToError(ctx))
packetProcessor, err := method.GetUDPClientProcessor(c.config.Ipsk, c.config.Psk, keyDerivation)
if err != nil {
return nil, newError("failed to create UDP client packet processor").Base(err)
}
return NewClientUDPSession(ctx, conn, packetProcessor), nil
})
if err != nil {
return nil, newError("failed to create UDP session").Base(err)
}
sessionConn, err := sessionState.NewSessionConn()
if err != nil {
return nil, newError("failed to create UDP session connection").Base(err)
}
return sessionConn, nil
}
func NewClient(ctx context.Context, config *ClientConfig) (*Client, error) {
storage := envctx.EnvironmentFromContext(ctx).(environment.ProxyEnvironment).TransientStorage()
udpState, err := NewClientUDPConnState()
if err != nil {
return nil, newError("failed to create UDP connection state").Base(err)
}
storage.Put(ctx, UDPConnectionState, udpState)
return &Client{
config: config,
ctx: ctx,
}, nil
}
func init() {
common.Must(common.RegisterConfig((*ClientConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
clientConfig, ok := config.(*ClientConfig)
if !ok {
return nil, newError("not a ClientConfig")
}
return NewClient(ctx, clientConfig)
}))
}