jrouter/router/router.go

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/*
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 (
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"context"
"gitea.drjosh.dev/josh/jrouter/atalk"
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"github.com/google/gopacket/pcap"
"github.com/sfiera/multitalk/pkg/ddp"
"github.com/sfiera/multitalk/pkg/ethernet"
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"github.com/sfiera/multitalk/pkg/ethertalk"
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)
type Router struct {
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Config *Config
PcapHandle *pcap.Handle
MyHWAddr ethernet.Addr
MyDDPAddr ddp.Addr
AARPMachine *AARPMachine
RouteTable *RoutingTable
ZoneTable *ZoneTable
}
func (rtr *Router) SendEtherTalkDDP(ctx context.Context, pkt *ddp.ExtPacket) error {
dstEth := ethertalk.AppleTalkBroadcast
if pkt.DstNode != 0xFF {
de, err := rtr.AARPMachine.Resolve(ctx, ddp.Addr{Network: pkt.DstNet, Node: pkt.DstNode})
if err != nil {
return err
}
dstEth = de
}
return rtr.sendEtherTalkDDP(dstEth, pkt)
}
func (rtr *Router) BroadcastEtherTalkDDP(pkt *ddp.ExtPacket) error {
return rtr.sendEtherTalkDDP(ethertalk.AppleTalkBroadcast, pkt)
}
func (rtr *Router) ZoneMulticastEtherTalkDDP(zone string, pkt *ddp.ExtPacket) error {
return rtr.sendEtherTalkDDP(atalk.MulticastAddr(zone), pkt)
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}
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func (rtr *Router) sendEtherTalkDDP(dstEth ethernet.Addr, pkt *ddp.ExtPacket) error {
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outFrame, err := ethertalk.AppleTalk(rtr.MyHWAddr, *pkt)
if err != nil {
return err
}
outFrame.Dst = dstEth
outFrameRaw, err := ethertalk.Marshal(*outFrame)
if err != nil {
return err
}
return rtr.PcapHandle.WritePacketData(outFrameRaw)
}