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Another strict size workaround

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Josh Deprez 2024-06-16 13:08:53 +10:00
parent 668fe5e722
commit 4dbf1b6f64
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1 changed files with 12 additions and 1 deletions
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13
router/port.go
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@ -18,6 +18,7 @@ package router
import (
"context"
"encoding/binary"
"errors"
"io"
"log"
@ -79,8 +80,18 @@ func (port *EtherTalkPort) Serve(ctx context.Context) {
case ethertalk.AppleTalkProto:
// log.Print("Got an AppleTalk frame")
// Workaround for strict length checking in sfiera/multitalk
payload := ethFrame.Payload
if len(payload) < 2 {
log.Printf("Couldn't unmarshal DDP packet: too small (length = %d)", len(payload))
}
if size := binary.BigEndian.Uint16(payload[:2]) & 0x3ff; len(payload) > int(size) {
payload = payload[:size]
}
ddpkt := new(ddp.ExtPacket)
if err := ddp.ExtUnmarshal(ethFrame.Payload, ddpkt); err != nil {
if err := ddp.ExtUnmarshal(payload, ddpkt); err != nil {
log.Printf("Couldn't unmarshal DDP packet: %v", err)
continue
}