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client.go
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client.go
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package shadowsocks
import (
"context"
"runtime"
"time"
"v2ray.com/core/app/log"
"v2ray.com/core/common"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/errors"
"v2ray.com/core/common/net"
"v2ray.com/core/common/protocol"
"v2ray.com/core/common/retry"
"v2ray.com/core/common/signal"
"v2ray.com/core/proxy"
"v2ray.com/core/transport/internet"
"v2ray.com/core/transport/ray"
)
// Client is a inbound handler for Shadowsocks protocol
type Client struct {
serverPicker protocol.ServerPicker
}
// NewClient create a new Shadowsocks client.
func NewClient(ctx context.Context, config *ClientConfig) (*Client, error) {
serverList := protocol.NewServerList()
for _, rec := range config.Server {
serverList.AddServer(protocol.NewServerSpecFromPB(*rec))
}
client := &Client{
serverPicker: protocol.NewRoundRobinServerPicker(serverList),
}
return client, nil
}
// Process implements OutboundHandler.Process().
func (v *Client) Process(ctx context.Context, outboundRay ray.OutboundRay, dialer proxy.Dialer) error {
destination, ok := proxy.TargetFromContext(ctx)
if !ok {
return errors.New("Shadowsocks|Client: Target not specified.")
}
network := destination.Network
var server *protocol.ServerSpec
var conn internet.Connection
err := retry.ExponentialBackoff(5, 100).On(func() error {
server = v.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.Base(err).RequireUserAction().Message("Shadowsocks|Client: Failed to find an available destination.")
}
log.Info("Shadowsocks|Client: Tunneling request to ", destination, " via ", server.Destination())
defer conn.Close()
conn.SetReusable(false)
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()
rawAccount, err := user.GetTypedAccount()
if err != nil {
log.Warning("Shadowsocks|Client: Failed to get a valid user account: ", err)
return err
}
account := rawAccount.(*ShadowsocksAccount)
request.User = user
if account.OneTimeAuth == Account_Auto || account.OneTimeAuth == Account_Enabled {
request.Option |= RequestOptionOneTimeAuth
}
ctx, cancel := context.WithCancel(ctx)
timer := signal.CancelAfterInactivity(ctx, cancel, time.Minute*2)
if request.Command == protocol.RequestCommandTCP {
bufferedWriter := buf.NewBufferedWriter(conn)
bodyWriter, err := WriteTCPRequest(request, bufferedWriter)
if err != nil {
log.Info("Shadowsocks|Client: Failed to write request: ", err)
return err
}
bufferedWriter.SetBuffered(false)
requestDone := signal.ExecuteAsync(func() error {
if err := buf.PipeUntilEOF(timer, outboundRay.OutboundInput(), bodyWriter); err != nil {
return err
}
return nil
})
responseDone := signal.ExecuteAsync(func() error {
defer outboundRay.OutboundOutput().Close()
responseReader, err := ReadTCPResponse(user, conn)
if err != nil {
return err
}
if err := buf.PipeUntilEOF(timer, responseReader, outboundRay.OutboundOutput()); err != nil {
return err
}
return nil
})
if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil {
log.Info("Shadowsocks|Client: Connection ends with ", err)
return err
}
return nil
}
if request.Command == protocol.RequestCommandUDP {
writer := &UDPWriter{
Writer: conn,
Request: request,
}
requestDone := signal.ExecuteAsync(func() error {
if err := buf.PipeUntilEOF(timer, outboundRay.OutboundInput(), writer); err != nil {
log.Info("Shadowsocks|Client: Failed to transport all UDP request: ", err)
return err
}
return nil
})
responseDone := signal.ExecuteAsync(func() error {
defer outboundRay.OutboundOutput().Close()
reader := &UDPReader{
Reader: conn,
User: user,
}
if err := buf.PipeUntilEOF(timer, reader, outboundRay.OutboundOutput()); err != nil {
log.Info("Shadowsocks|Client: Failed to transport all UDP response: ", err)
return err
}
return nil
})
if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil {
log.Info("Shadowsocks|Client: Connection ends with ", err)
return err
}
return nil
}
runtime.KeepAlive(timer)
return nil
}
func init() {
common.Must(common.RegisterConfig((*ClientConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return NewClient(ctx, config.(*ClientConfig))
}))
}