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disp.go
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disp.go
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// Copyright 2017 ETH Zurich
// Copyright 2018 ETH Zurich, Anapaya Systems
//
// 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 pktdisp
import (
"github.com/scionproto/scion/go/lib/common"
"github.com/scionproto/scion/go/lib/fatal"
"github.com/scionproto/scion/go/lib/log"
"github.com/scionproto/scion/go/lib/snet"
"github.com/scionproto/scion/go/lib/sock/reliable"
)
type DispPkt struct {
Raw common.RawBytes
Addr *snet.Addr
}
type DispatchFunc func(*DispPkt)
// PktDispatcher listens on c, and calls f for every packet read.
// N.B. the DispPkt passed to f is reused, so applications should make a copy if
// this is a problem.
func PktDispatcher(c snet.Conn, f DispatchFunc, pktDispStop chan struct{}) {
fatal.Check()
var err error
var n int
dp := &DispPkt{Raw: make(common.RawBytes, common.MaxMTU)}
for {
select {
case <-pktDispStop:
return
default:
dp.Raw = dp.Raw[:cap(dp.Raw)]
n, dp.Addr, err = c.ReadFromSCION(dp.Raw)
if err != nil {
if reliable.IsDispatcherError(err) {
fatal.Fatal(err)
return
}
log.Error("PktDispatcher: Error reading from connection", "err", err)
// FIXME(shitz): Continuing here is only a temporary solution. Different
// errors need to be handled different, for some it should break and others
// are recoverable.
continue
}
dp.Raw = dp.Raw[:n]
f(dp)
}
}
}
func DispLogger(dp *DispPkt) {
log.Debug("DispLogger", "src", dp.Addr, "raw", dp.Raw)
}