josh/jrouter
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WIP: Start implementing AARP

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This commit is contained in:
Josh Deprez 2024-04-05 17:59:47 +11:00
parent 90649c3c9d
commit f2b3b20a71
Signed by: josh
SSH key fingerprint: SHA256:zZji7w1Ilh2RuUpbQcqkLPrqmRwpiCSycbF2EfKm6Kw
1 changed files with 29 additions and 2 deletions
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31
main.go
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@ -34,6 +34,7 @@ import (
"gitea.drjosh.dev/josh/jrouter/aurp"
"github.com/sfiera/multitalk/pkg/aarp"
"github.com/sfiera/multitalk/pkg/ddp"
"github.com/sfiera/multitalk/pkg/ethernet"
"github.com/sfiera/multitalk/pkg/ethertalk"
)
@ -139,6 +140,11 @@ func main() {
}
// AppleTalk packet loop
type amtEntry struct {
hwAddr ethernet.Addr
last time.Time
}
amt := make(map[ddp.Addr]amtEntry)
go func() {
iface, err := net.InterfaceByName(cfg.EtherTalk.Device)
if err != nil {
@ -175,7 +181,28 @@ func main() {
log.Printf("Couldn't unmarshal AARP packet: %v", err)
continue
}
log.Printf("Read AARP packet with opcode %d src %+v dst %+v", aapkt.Opcode, aapkt.Src, aapkt.Dst)
switch aapkt.Opcode {
case aarp.RequestOp:
log.Printf("AARP: Who has %v? Tell %v", aapkt.Dst.Proto, aapkt.Src.Proto)
// Glean that aapkt.Src.Proto -> aapkt.Src.Hardware
amt[aapkt.Src.Proto] = amtEntry{
hwAddr: aapkt.Src.Hardware,
last: time.Now(),
}
log.Printf("AARP: Gleaned that %v -> %v", aapkt.Src.Proto, aapkt.Src.Hardware)
case aarp.ResponseOp:
log.Printf("AARP: %v is at %v", aapkt.Dst.Proto, aapkt.Dst.Hardware)
amt[aapkt.Dst.Proto] = amtEntry{
hwAddr: aapkt.Dst.Hardware,
last: time.Now(),
}
case aarp.ProbeOp:
log.Printf("AARP: %v probing to see if %v is available", aapkt.Src.Hardware, aapkt.Src.Proto)
// AMT should not be updated, because the address is tentative
}
case ethertalk.AppleTalkProto:
var ddpkt ddp.ExtPacket
@ -183,7 +210,7 @@ func main() {
log.Printf("Couldn't unmarshal DDP packet: %v", err)
continue
}
log.Printf("Read AppleTalk packet with src net %d node %d socket %d dst net %d node %d socket %d data len %d", ddpkt.SrcNet, ddpkt.SrcNode, ddpkt.SrcSocket, ddpkt.DstNet, ddpkt.DstNode, ddpkt.DstSocket, len(ddpkt.Data))
log.Printf("Read AppleTalk packet with src (net %d node %d socket %d) dst (net %d node %d socket %d) data len %d", ddpkt.SrcNet, ddpkt.SrcNode, ddpkt.SrcSocket, ddpkt.DstNet, ddpkt.DstNode, ddpkt.DstSocket, len(ddpkt.Data))
default:
log.Printf("Read unknown packet %s -> %s with payload %x", pkt.Src, pkt.Dst, pkt.Payload)