jrouter/router/peer_eth.go

54 lines
1.5 KiB
Go

/*
Copyright 2024 Josh Deprez
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 router
import (
"context"
"github.com/google/gopacket/pcap"
"github.com/sfiera/multitalk/pkg/ddp"
"github.com/sfiera/multitalk/pkg/ethernet"
"github.com/sfiera/multitalk/pkg/ethertalk"
)
// EtherTalkPeer holds data needed to exchange routes and zones with another
// router on the EtherTalk network.
type EtherTalkPeer struct {
PcapHandle *pcap.Handle
MyHWAddr ethernet.Addr
AARP *AARPMachine
PeerAddr ddp.Addr
}
// Forward forwards a DDP packet to the next router.
func (p *EtherTalkPeer) Forward(ctx context.Context, pkt *ddp.ExtPacket) error {
// TODO: AARP resolution can block
de, err := p.AARP.Resolve(ctx, p.PeerAddr)
if err != nil {
return err
}
outFrame, err := ethertalk.AppleTalk(p.MyHWAddr, *pkt)
if err != nil {
return err
}
outFrame.Dst = de
outFrameRaw, err := ethertalk.Marshal(*outFrame)
if err != nil {
return err
}
return p.PcapHandle.WritePacketData(outFrameRaw)
}