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refactor tproxy handling in dokodemo

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Darien Raymond 2019-01-27 22:30:34 +01:00
parent 7bb5db712d
commit bb5a959876
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GPG Key ID: 7251FFA14BB18169
1 changed files with 43 additions and 49 deletions
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92
proxy/dokodemo/dokodemo.go
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@ -117,60 +117,54 @@ func (d *DokodemoDoor) Process(ctx context.Context, network net.Network, conn in
return nil return nil
} }
var tConn net.Conn tproxyRequest := func() error {
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 !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)
}
var err error
tConn, err = internet.DialSystem(ctx, net.DestinationFromAddr(conn.RemoteAddr()), sockopt)
if err != nil {
return err
}
writer = &buf.SequentialWriter{Writer: tConn}
tReader := buf.NewReader(tConn)
go func() {
defer tConn.Close()
defer common.Close(link.Writer)
if err := buf.Copy(tReader, link.Writer, buf.UpdateActivity(timer)); err != nil {
newError("failed to transport request (TPROXY conn)").Base(err).WriteToLog()
}
}()
}
}
defer func() {
if tConn != nil {
tConn.Close()
}
}()
if err := buf.Copy(link.Reader, writer, buf.UpdateActivity(timer)); err != nil {
return newError("failed to transport response").Base(err)
}
return nil return nil
} }
if err := task.Run(ctx, task.OnSuccess(requestDone, task.Close(link.Writer)), responseDone); err != 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.NewReader(tConn)
tproxyRequest = func() error {
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.Reader)
common.Interrupt(link.Writer) common.Interrupt(link.Writer)
if tConn != nil {
tConn.Close()
}
return newError("connection ends").Base(err) return newError("connection ends").Base(err)
} }