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dokodemo.go
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dokodemo.go
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package dokodemo
//go:generate errorgen
import (
"context"
"time"
"v2ray.com/core"
"v2ray.com/core/common"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/net"
"v2ray.com/core/common/session"
"v2ray.com/core/common/signal"
"v2ray.com/core/common/task"
"v2ray.com/core/transport/internet"
"v2ray.com/core/transport/pipe"
)
type DokodemoDoor struct {
policyManager core.PolicyManager
config *Config
address net.Address
port net.Port
}
func New(ctx context.Context, config *Config) (*DokodemoDoor, error) {
if config.NetworkList == nil || config.NetworkList.Size() == 0 {
return nil, newError("no network specified")
}
v := core.MustFromContext(ctx)
d := &DokodemoDoor{
config: config,
address: config.GetPredefinedAddress(),
port: net.Port(config.Port),
policyManager: v.PolicyManager(),
}
return d, nil
}
func (d *DokodemoDoor) Network() net.NetworkList {
return *(d.config.NetworkList)
}
func (d *DokodemoDoor) policy() core.Policy {
config := d.config
p := d.policyManager.ForLevel(config.UserLevel)
if config.Timeout > 0 && config.UserLevel == 0 {
p.Timeouts.ConnectionIdle = time.Duration(config.Timeout) * time.Second
}
return p
}
type hasHandshakeAddress interface {
HandshakeAddress() net.Address
}
func (d *DokodemoDoor) Process(ctx context.Context, network net.Network, conn internet.Connection, dispatcher core.Dispatcher) error {
newError("processing connection from: ", conn.RemoteAddr()).AtDebug().WriteToLog(session.ExportIDToError(ctx))
dest := net.Destination{
Network: network,
Address: d.address,
Port: d.port,
}
if d.config.FollowRedirect {
if outbound := session.OutboundFromContext(ctx); outbound != nil && outbound.Target.IsValid() {
dest = outbound.Target
} else if handshake, ok := conn.(hasHandshakeAddress); ok {
addr := handshake.HandshakeAddress()
if addr != nil {
dest.Address = addr
}
}
}
if !dest.IsValid() || dest.Address == nil {
return newError("unable to get destination")
}
plcy := d.policy()
ctx, cancel := context.WithCancel(ctx)
timer := signal.CancelAfterInactivity(ctx, cancel, plcy.Timeouts.ConnectionIdle)
ctx = core.ContextWithBufferPolicy(ctx, plcy.Buffer)
link, err := dispatcher.Dispatch(ctx, dest)
if err != nil {
return newError("failed to dispatch request").Base(err)
}
requestDone := func() error {
defer timer.SetTimeout(plcy.Timeouts.DownlinkOnly)
reader := buf.NewReader(conn)
if err := buf.Copy(reader, link.Writer, buf.UpdateActivity(timer)); err != nil {
return newError("failed to transport request").Base(err)
}
return nil
}
responseDone := func() error {
defer timer.SetTimeout(plcy.Timeouts.UplinkOnly)
var writer buf.Writer
if network == net.Network_TCP {
writer = buf.NewWriter(conn)
} else {
//if we are in TPROXY mode, use linux's udp forging functionality
if !d.config.FollowRedirect {
writer = &buf.SequentialWriter{Writer: conn}
} else {
tCtx := internet.ContextWithBindAddress(context.Background(), dest)
tCtx = internet.ContextWithStreamSettings(tCtx, &internet.MemoryStreamConfig{
ProtocolName: "udp",
SocketSettings: &internet.SocketConfig{
Tproxy: internet.SocketConfig_TProxy,
},
})
tConn, err := internet.DialSystem(tCtx, net.DestinationFromAddr(conn.RemoteAddr()))
if err != nil {
return err
}
writer = &buf.SequentialWriter{Writer: tConn}
}
}
if err := buf.Copy(link.Reader, writer, buf.UpdateActivity(timer)); err != nil {
return newError("failed to transport response").Base(err)
}
return nil
}
if err := task.Run(task.WithContext(ctx),
task.Parallel(
task.Single(requestDone, task.OnSuccess(task.Close(link.Writer))),
responseDone))(); err != nil {
pipe.CloseError(link.Reader)
pipe.CloseError(link.Writer)
return newError("connection ends").Base(err)
}
return nil
}
func init() {
common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return New(ctx, config.(*Config))
}))
}