josh/jrouter
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Refactor that might not make sense

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This commit is contained in:
Josh Deprez 2024-04-23 09:50:17 +10:00
parent 07e4e5069f
commit bb2a5dff27
Signed by: josh
SSH key fingerprint: SHA256:zZji7w1Ilh2RuUpbQcqkLPrqmRwpiCSycbF2EfKm6Kw
7 changed files with 48 additions and 30 deletions
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5
atalk/strings.go
View file

@ -20,6 +20,7 @@ import (
"math/bits"
"github.com/sfiera/multitalk/pkg/ethernet"
"github.com/sfiera/multitalk/pkg/ethertalk"
)
// Inside AppleTalk, appendix D
@ -96,6 +97,10 @@ func ToUpper(s string) string {
}
func MulticastAddr(zone string) ethernet.Addr {
if zone == "" || zone == "*" {
return ethertalk.AppleTalkBroadcast
}
// Inside AppleTalk, pp 3-10 and pp 8-18
h := Checksum(ToUpper(zone))
return ethernet.Addr{0x09, 0x00, 0x07, 0x00, 0x00, byte(h % 0xFD)}

10
main.go
View file

@ -341,7 +341,7 @@ func main() {
}
case 6: // The ZIS (zone information socket / ZIP socket)
if err := rooter.HandleZIP(ethFrame.Src, ddpkt); err != nil {
if err := rooter.HandleZIP(ctx, ethFrame.Src, ddpkt); err != nil {
log.Printf("ZIP: couldn't handle: %v", err)
}
@ -474,13 +474,7 @@ func main() {
}
// Note: resolving AARP can block
dstEth, err := aarpMachine.Resolve(ctx, ddp.Addr{Network: ddpkt.DstNet, Node: ddpkt.DstNode})
if err != nil {
log.Printf("DDP/AURP: couldn't resolve DDP dest %d.%d to an Ethernet address", ddpkt.DstNet, ddpkt.DstNode)
continue
}
if err := rooter.SendEtherTalkDDP(dstEth, ddpkt); err != nil {
if err := rooter.SendEtherTalkDDP(ctx, ddpkt); err != nil {
log.Printf("DDP/AURP: couldn't send Ethertalk out: %v", err)
}
continue

2
router/aep.go
View file

@ -47,7 +47,7 @@ func (rtr *Router) HandleAEP(src ethernet.Addr, ddpkt *ddp.ExtPacket) error {
ddpkt.DstSocket, ddpkt.SrcSocket = ddpkt.SrcSocket, ddpkt.DstSocket
ddpkt.Data[0] = byte(aep.EchoReply)
return rtr.SendEtherTalkDDP(src, ddpkt)
return rtr.sendEtherTalkDDP(src, ddpkt)
default:
return fmt.Errorf("invalid AEP function %d", ep.Function)

6
router/nbp.go
View file

@ -47,7 +47,7 @@ func (rtr *Router) HandleNBP(srcHWAddr ethernet.Addr, ddpkt *ddp.ExtPacket) erro
return err
}
log.Print("NBP: Replying to LkUp with LkUp-Reply for myself")
return rtr.SendEtherTalkDDP(srcHWAddr, outDDP)
return rtr.sendEtherTalkDDP(srcHWAddr, outDDP)
case nbp.FunctionBrRq:
// There must be 1!
@ -80,7 +80,7 @@ func (rtr *Router) HandleNBP(srcHWAddr ethernet.Addr, ddpkt *ddp.ExtPacket) erro
outDDP.DstNode = 0xFF // Broadcast node address within the dest network
outDDP.Data = nbpRaw
if err := rtr.SendEtherTalkDDP(ethDst, &outDDP); err != nil {
if err := rtr.sendEtherTalkDDP(ethDst, &outDDP); err != nil {
return err
}
@ -93,7 +93,7 @@ func (rtr *Router) HandleNBP(srcHWAddr ethernet.Addr, ddpkt *ddp.ExtPacket) erro
continue
}
log.Print("NBP: Replying to BrRq with LkUp-Reply for myself")
if err := rtr.SendEtherTalkDDP(srcHWAddr, outDDP2); err != nil {
if err := rtr.sendEtherTalkDDP(srcHWAddr, outDDP2); err != nil {
return err
}

8
router/nbp_aurp.go
View file

@ -20,10 +20,8 @@ import (
"fmt"
"log"
"gitea.drjosh.dev/josh/jrouter/atalk"
"gitea.drjosh.dev/josh/jrouter/atalk/nbp"
"github.com/sfiera/multitalk/pkg/ddp"
"github.com/sfiera/multitalk/pkg/ethertalk"
)
func (rtr *Router) HandleNBPInAURP(peer *Peer, ddpkt *ddp.ExtPacket) error {
@ -67,11 +65,7 @@ func (rtr *Router) HandleNBPInAURP(peer *Peer, ddpkt *ddp.ExtPacket) error {
ddpkt.DstNode = 0xFF // Broadcast node address within the dest network
ddpkt.Data = nbpRaw
dstEth := ethertalk.AppleTalkBroadcast
if tuple.Zone != "*" && tuple.Zone != "" {
dstEth = atalk.MulticastAddr(tuple.Zone)
}
if err := rtr.SendEtherTalkDDP(dstEth, ddpkt); err != nil {
if err := rtr.ZoneMulticastEtherTalkDDP(tuple.Zone, ddpkt); err != nil {
return err
}

38
router/router.go
View file

@ -17,6 +17,9 @@
package router
import (
"context"
"gitea.drjosh.dev/josh/jrouter/atalk"
"github.com/google/gopacket/pcap"
"github.com/sfiera/multitalk/pkg/ddp"
"github.com/sfiera/multitalk/pkg/ethernet"
@ -24,15 +27,36 @@ import (
)
type Router struct {
Config *Config
PcapHandle *pcap.Handle
MyHWAddr ethernet.Addr
MyDDPAddr ddp.Addr
RouteTable *RoutingTable
ZoneTable *ZoneTable
Config *Config
PcapHandle *pcap.Handle
MyHWAddr ethernet.Addr
MyDDPAddr ddp.Addr
AARPMachine *AARPMachine
RouteTable *RoutingTable
ZoneTable *ZoneTable
}
func (rtr *Router) SendEtherTalkDDP(dstEth ethernet.Addr, pkt *ddp.ExtPacket) error {
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)
}
func (rtr *Router) sendEtherTalkDDP(dstEth ethernet.Addr, pkt *ddp.ExtPacket) error {
outFrame, err := ethertalk.AppleTalk(rtr.MyHWAddr, *pkt)
if err != nil {
return err

9
router/zip.go
View file

@ -17,6 +17,7 @@
package router
import (
"context"
"fmt"
"log"
@ -28,7 +29,7 @@ import (
"github.com/sfiera/multitalk/pkg/ethertalk"
)
func (rtr *Router) HandleZIP(srcHWAddr ethernet.Addr, ddpkt *ddp.ExtPacket) error {
func (rtr *Router) HandleZIP(ctx context.Context, srcHWAddr ethernet.Addr, ddpkt *ddp.ExtPacket) error {
switch ddpkt.Proto {
case ddp.ProtoATP:
atpkt, err := atp.UnmarshalPacket(ddpkt.Data)
@ -106,7 +107,7 @@ func (rtr *Router) HandleZIP(srcHWAddr ethernet.Addr, ddpkt *ddp.ExtPacket) erro
},
Data: ddpBody,
}
return rtr.SendEtherTalkDDP(srcHWAddr, respDDP)
return rtr.sendEtherTalkDDP(srcHWAddr, respDDP)
case *atp.TResp:
return fmt.Errorf("TODO: support handling ZIP ATP replies?")
@ -145,7 +146,7 @@ func (rtr *Router) HandleZIP(srcHWAddr ethernet.Addr, ddpkt *ddp.ExtPacket) erro
},
Data: respRaw,
}
return rtr.SendEtherTalkDDP(srcHWAddr, outDDP)
return rtr.sendEtherTalkDDP(srcHWAddr, outDDP)
}
// Inside AppleTalk SE, pp 8-11:
@ -272,7 +273,7 @@ func (rtr *Router) HandleZIP(srcHWAddr ethernet.Addr, ddpkt *ddp.ExtPacket) erro
dstEth = srcHWAddr
}
return rtr.SendEtherTalkDDP(dstEth, outDDP)
return rtr.sendEtherTalkDDP(dstEth, outDDP)
default:
return fmt.Errorf("TODO: handle type %T", zipkt)