func (p *Pcap) NextEx() (pkt *Packet, result int32) {
var pkthdr_ptr *C.struct_pcap_pkthdr
var pkthdr C.struct_pcap_pkthdr
var buf_ptr *C.u_char
var buf unsafe.Pointer
result = int32(C.hack_pcap_next_ex(p.cptr, &pkthdr_ptr, &buf_ptr))
buf = unsafe.Pointer(buf_ptr)
pkthdr = *pkthdr_ptr
if nil == buf {
pkt = nil
return
}
pkt = new(Packet)
pkt.Time.Sec = int32(pkthdr.ts.tv_sec)
pkt.Time.Usec = int32(pkthdr.ts.tv_usec)
pkt.Caplen = uint32(pkthdr.caplen)
pkt.Len = uint32(pkthdr.len)
pkt.Data = make([]byte, pkthdr.caplen)
for i := uint32(0); i < pkt.Caplen; i++ {
pkt.Data[i] = *(*byte)(unsafe.Pointer(uintptr(buf) + uintptr(i)))
}
return
}
func (p *Pcap) NextEx() (pkt *Packet, result int32) {
var pkthdr_ptr *C.struct_pcap_pkthdr
var pkthdr C.struct_pcap_pkthdr
var buf_ptr *C.u_char
var buf unsafe.Pointer
result = int32(C.hack_pcap_next_ex(p.cptr, &pkthdr_ptr, &buf_ptr))
buf = unsafe.Pointer(buf_ptr)
pkthdr = *pkthdr_ptr
if nil == buf {
return
}
pkt = new(Packet)
pkt.Time = time.Unix(int64(pkthdr.ts.tv_sec), int64(pkthdr.ts.tv_usec)*1000) // pcap provides usec but time.Unix requires nsec
pkt.Caplen = uint32(pkthdr.caplen)
pkt.Len = uint32(pkthdr.len)
pkt.Data = make([]byte, pkthdr.caplen)
pkt.DataLink = p.datalink
for i := uint32(0); i < pkt.Caplen; i++ {
pkt.Data[i] = *(*byte)(unsafe.Pointer(uintptr(buf) + uintptr(i)))
}
return
}
func (p *Pcap) PcapLoop(pktnum int, dumper *PcapDumper) (result int32, err error) {
var pkthdr_ptr *C.struct_pcap_pkthdr
var buf_ptr *C.u_char
for i := 0; true; {
result = int32(C.hack_pcap_next_ex(p.cptr, &pkthdr_ptr, &buf_ptr))
switch result {
case 0:
continue // timeout
case 1:
// success : capturing packet
case -1:
return result, errors.New("Error in pcap next ex")
case -2:
return // reach EOF in offline mode
}
if nil == buf_ptr {
continue
}
if nil != dumper {
p.PcapDump(dumper, pkthdr_ptr, buf_ptr)
p.PcapDumpFlush(dumper)
}
if pktnum > 0 {
i++
if i >= pktnum {
break
}
}
}
return
}
func (p *Pcap) NextEx() (pkt *Packet, result int32) {
var pkthdr *C.struct_pcap_pkthdr
var buf_ptr *C.u_char
var buf unsafe.Pointer
result = int32(C.hack_pcap_next_ex(p.cptr, &pkthdr, &buf_ptr))
buf = unsafe.Pointer(buf_ptr)
if nil == buf {
return
}
pkt = new(Packet)
pkt.Time = time.Unix(int64(pkthdr.ts.tv_sec), int64(pkthdr.ts.tv_usec)*1000)
pkt.Caplen = uint32(pkthdr.caplen)
pkt.Len = uint32(pkthdr.len)
pkt.Data = C.GoBytes(buf, C.int(pkthdr.caplen))
return
}