Matthias Radestock
7c4464c852
they contain an errbuf; there might be other issues too. So we must use different handles in the sniffer and udplistener goroutines.
60 lines
1.2 KiB
Go
60 lines
1.2 KiB
Go
package weave
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import (
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"code.google.com/p/gopacket/pcap"
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)
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type PcapIO struct {
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handle *pcap.Handle
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}
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func NewPcapIO(ifName string, bufSz int) (pio PacketSourceSink, err error) {
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pio, err = newPcapIO(ifName, true, 65535, bufSz)
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return
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}
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func NewPcapO(ifName string) (po PacketSink, err error) {
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po, err = newPcapIO(ifName, false, 0, 0)
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return
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}
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func newPcapIO(ifName string, promisc bool, snaplen int, bufSz int) (handle *PcapIO, err error) {
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inactive, err := pcap.NewInactiveHandle(ifName)
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if err != nil {
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return
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}
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defer inactive.CleanUp()
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if inactive.SetPromisc(promisc) != nil {
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return
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}
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if inactive.SetSnapLen(snaplen) != nil {
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return
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}
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if inactive.SetTimeout(-1) != nil {
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return
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}
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if inactive.SetImmediateMode(true) != nil {
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return
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}
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if inactive.SetBufferSize(bufSz) != nil {
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return
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}
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active, err := inactive.Activate()
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if err != nil {
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return
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}
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if active.SetDirection(pcap.DirectionIn) != nil {
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return
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}
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return &PcapIO{handle: active}, nil
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}
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func (pi *PcapIO) ReadPacket() (data []byte, err error) {
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data, _, err = pi.handle.ReadPacketData()
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return
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}
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func (po *PcapIO) WritePacket(data []byte) error {
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return po.handle.WritePacketData(data)
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}
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