fix: 部分虚拟网卡模式下，arp包需要no-padding

XinRoom · Dec 5, 2022 · 9de1f2f · 9de1f2f
1 parent 1152e76
commit 9de1f2f
Showing 1 changed file with 14 additions and 1 deletion.
diff --git a/core/port/syn/syn.go b/core/port/syn/syn.go
@@ -263,7 +263,7 @@ func (ss *synScanner) getHwAddrV4(arpDst net.IP) (mac net.HardwareAddr, err erro
 		DstProtAddress:    []byte(arpDst),
 	}
 
-	if err = ss.send(&eth, &arp); err != nil {
+	if err = ss.sendArp(&eth, &arp); err != nil {
 		return nil, err
 	}
 
@@ -303,6 +303,19 @@ func (ss *synScanner) send(l ...gopacket.SerializableLayer) error {
 	return ss.handle.WritePacketData(buf.Bytes())
 }
 
+// send sends the given layers as a single packet on the network., need fix padding
+func (ss *synScanner) sendArp(l ...gopacket.SerializableLayer) error {
+	buf := ss.bufPool.Get().(gopacket.SerializeBuffer)
+	defer func() {
+		buf.Clear()
+		ss.bufPool.Put(buf)
+	}()
+	if err := gopacket.SerializeLayers(buf, ss.opts, l...); err != nil {
+		return err
+	}
+	return ss.handle.WritePacketData(buf.Bytes()[:42]) // need fix padding
+}
+
 // recv packet on the network.
 func (ss *synScanner) recv() {
 	eth := layers.Ethernet{