forked from scionproto/scion
/
adapter.go
71 lines (61 loc) · 2.33 KB
/
adapter.go
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// Copyright 2018 ETH Zurich
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package messenger
import (
"strconv"
"github.com/scionproto/scion/go/lib/common"
"github.com/scionproto/scion/go/lib/ctrl"
"github.com/scionproto/scion/go/lib/infra/disp"
"github.com/scionproto/scion/go/lib/infra/messenger/internal/metrics"
"github.com/scionproto/scion/go/lib/log"
"github.com/scionproto/scion/go/proto"
)
var _ disp.MessageAdapter = (*Adapter)(nil)
// Adapter implements disp.MessageAdapter for ctrl.SignedPld.
type Adapter struct{}
// Default adapter
var DefaultAdapter = &Adapter{}
func (a *Adapter) MsgToRaw(msg proto.Cerealizable) (common.RawBytes, error) {
pld, ok := msg.(*ctrl.SignedPld)
if !ok {
return nil, common.NewBasicError(
"Unable to type assert proto.Cerealizable to ctrl.SignedPld",
nil, "msg", msg, "type", common.TypeOf(msg))
}
return pld.PackPld()
}
func (a *Adapter) RawToMsg(b common.RawBytes) (proto.Cerealizable, error) {
return ctrl.NewSignedPldFromRaw(b)
}
func (a *Adapter) MsgKey(msg proto.Cerealizable) string {
signedCtrlPld, ok := msg.(*ctrl.SignedPld)
if !ok {
// FIXME(scrye): Change interface to handle key errors instead of
// logging it here
metrics.Adapter.Errors(metrics.ResultLabels{Result: metrics.ErrInvalidReq})
log.Warn("Unable to type assert disp.Message to ctrl.SignedPld", "msg", msg,
"type", common.TypeOf(msg))
return ""
}
// XXX(scrye): For request/response matching based on ID, verification is
// not taken into account. This allows attackers to change the ID in a
// response to make it match any outstanding request.
ctrlPld, err := signedCtrlPld.UnsafePld()
if err != nil {
metrics.Adapter.Errors(metrics.ResultLabels{Result: metrics.ErrParse})
log.Warn("Unable to extract CtrlPld from SignedCtrlPld", "err", err)
return ""
}
return strconv.FormatUint(ctrlPld.ReqId, 10)
}