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client.go
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client.go
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package shadowsocks
import (
"context"
"v2ray.com/core"
"v2ray.com/core/common"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/net"
"v2ray.com/core/common/protocol"
"v2ray.com/core/common/retry"
"v2ray.com/core/common/session"
"v2ray.com/core/common/signal"
"v2ray.com/core/common/task"
"v2ray.com/core/features/policy"
"v2ray.com/core/transport"
"v2ray.com/core/transport/internet"
)
// 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, newError("failed to parse server spec").Base(err)
}
serverList.AddServer(s)
}
if serverList.Size() == 0 {
return nil, newError("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 {
outbound := session.OutboundFromContext(ctx)
if outbound == nil || !outbound.Target.IsValid() {
return newError("target not specified")
}
destination := outbound.Target
network := destination.Network
var server *protocol.ServerSpec
var conn internet.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 newError("failed to find an available destination").AtWarning().Base(err)
}
newError("tunneling request to ", destination, " via ", server.Destination()).WriteToLog(session.ExportIDToError(ctx))
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()
account, ok := user.Account.(*MemoryAccount)
if !ok {
return newError("user account is not valid")
}
request.User = user
if account.OneTimeAuth == Account_Auto || account.OneTimeAuth == Account_Enabled {
request.Option |= RequestOptionOneTimeAuth
}
sessionPolicy := c.policyManager.ForLevel(user.Level)
ctx, cancel := context.WithCancel(ctx)
timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle)
if request.Command == protocol.RequestCommandTCP {
bufferedWriter := buf.NewBufferedWriter(buf.NewWriter(conn))
bodyWriter, err := WriteTCPRequest(request, bufferedWriter)
if err != nil {
return newError("failed to write request").Base(err)
}
if err := bufferedWriter.SetBuffered(false); err != nil {
return err
}
requestDone := func() error {
defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
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))
}
var responseDoneAndCloseWriter = task.Single(responseDone, task.OnSuccess(task.Close(link.Writer)))
if err := task.Run(task.WithContext(ctx), task.Parallel(requestDone, responseDoneAndCloseWriter))(); err != nil {
return newError("connection ends").Base(err)
}
return nil
}
if request.Command == protocol.RequestCommandUDP {
writer := &buf.SequentialWriter{Writer: &UDPWriter{
Writer: conn,
Request: request,
}}
requestDone := func() error {
defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
if err := buf.Copy(link.Reader, writer, buf.UpdateActivity(timer)); err != nil {
return newError("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 newError("failed to transport all UDP response").Base(err)
}
return nil
}
var responseDoneAndCloseWriter = task.Single(responseDone, task.OnSuccess(task.Close(link.Writer)))
if err := task.Run(task.WithContext(ctx), task.Parallel(requestDone, responseDoneAndCloseWriter))(); err != nil {
return newError("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))
}))
}