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dokodemo.go
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dokodemo.go
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// +build !confonly
package dokodemo
//go:generate errorgen
import (
"context"
"sync/atomic"
"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/features/policy"
"v2ray.com/core/features/routing"
"v2ray.com/core/transport/internet"
)
func init() {
common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
d := new(DokodemoDoor)
err := core.RequireFeatures(ctx, func(pm policy.Manager) error {
return d.Init(config.(*Config), pm)
})
return d, err
}))
}
type DokodemoDoor struct {
policyManager policy.Manager
config *Config
address net.Address
port net.Port
}
// Init initializes the DokodemoDoor instance with necessary parameters.
func (d *DokodemoDoor) Init(config *Config, pm policy.Manager) error {
if (config.NetworkList == nil || len(config.NetworkList.Network) == 0) && len(config.Networks) == 0 {
return newError("no network specified")
}
d.config = config
d.address = config.GetPredefinedAddress()
d.port = net.Port(config.Port)
d.policyManager = pm
return nil
}
// Network implements proxy.Inbound.
func (d *DokodemoDoor) Network() []net.Network {
if len(d.config.Networks) > 0 {
return d.config.Networks
}
return d.config.NetworkList.Network
}
func (d *DokodemoDoor) policy() policy.Session {
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
}
// Process implements proxy.Inbound.
func (d *DokodemoDoor) Process(ctx context.Context, network net.Network, conn internet.Connection, dispatcher routing.Dispatcher) error {
newError("processing connection from: ", conn.RemoteAddr()).AtDebug().WriteToLog(session.ExportIDToError(ctx))
dest := net.Destination{
Network: network,
Address: d.address,
Port: d.port,
}
destinationOverridden := false
if d.config.FollowRedirect {
if outbound := session.OutboundFromContext(ctx); outbound != nil && outbound.Target.IsValid() {
dest = outbound.Target
destinationOverridden = true
} else if handshake, ok := conn.(hasHandshakeAddress); ok {
addr := handshake.HandshakeAddress()
if addr != nil {
dest.Address = addr
destinationOverridden = true
}
}
}
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 = policy.ContextWithBufferPolicy(ctx, plcy.Buffer)
link, err := dispatcher.Dispatch(ctx, dest)
if err != nil {
return newError("failed to dispatch request").Base(err)
}
requestCount := int32(1)
requestDone := func() error {
defer func() {
if atomic.AddInt32(&requestCount, -1) == 0 {
timer.SetTimeout(plcy.Timeouts.DownlinkOnly)
}
}()
var reader buf.Reader
if dest.Network == net.Network_UDP {
reader = buf.NewPacketReader(conn)
} else {
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
}
tproxyRequest := func() error {
return nil
}
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 !destinationOverridden {
writer = &buf.SequentialWriter{Writer: conn}
} else {
sockopt := &internet.SocketConfig{
Tproxy: internet.SocketConfig_TProxy,
}
if dest.Address.Family().IsIP() {
sockopt.BindAddress = dest.Address.IP()
sockopt.BindPort = uint32(dest.Port)
}
tConn, err := internet.DialSystem(ctx, net.DestinationFromAddr(conn.RemoteAddr()), sockopt)
if err != nil {
return err
}
defer tConn.Close()
writer = &buf.SequentialWriter{Writer: tConn}
tReader := buf.NewPacketReader(tConn)
requestCount++
tproxyRequest = func() error {
defer func() {
if atomic.AddInt32(&requestCount, -1) == 0 {
timer.SetTimeout(plcy.Timeouts.DownlinkOnly)
}
}()
if err := buf.Copy(tReader, link.Writer, buf.UpdateActivity(timer)); err != nil {
return newError("failed to transport request (TPROXY conn)").Base(err)
}
return nil
}
}
}
responseDone := func() error {
defer timer.SetTimeout(plcy.Timeouts.UplinkOnly)
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(ctx, task.OnSuccess(requestDone, task.Close(link.Writer)), responseDone, tproxyRequest); err != nil {
common.Interrupt(link.Reader)
common.Interrupt(link.Writer)
return newError("connection ends").Base(err)
}
return nil
}