def parse_ether_header(frm):
etherdata = frm[0:14]
etherh = tcplib.etherhdr()
etherh.parsehdr(etherdata)
payload = frm[14:len(frm)]
return etherh, payload
def pcap_send_segments(ifname, pkts, smacaddr=0, dmacaddr=0, sent=None):
# Open pcap descripter
plib = pcaplib.pcaplib()
if plib.lib == None:
print "Error: failed to load libpcap"
return -1
descrip = plib.Pcap_open_live(ifname)
if descrip == None:
print "Error: failed to open pcap descripter"
return -1
# Compose packets including datalink header
frms = []
dltype = plib.Pcap_datalink(descrip)
for pkt in pkts:
frm = ""
if dltype == pcaplib.DLT_EN10MB:
etherh = tcplib.etherhdr(dmacaddr, smacaddr, 0x0800)
frm = etherh.bin()
elif dltype == pcaplib.DLT_PPP or (dltype == 0 and re.match('ng[0-9]', ifname)):
frm = struct.pack('!BBBB', 0xff, 0x03, 0x00, 0x21)
else:
print "Error: unsupported link type"
return -1
frm += pkt
frms.append(frm)
# Send frames
for frm in frms:
err = plib.Pcap_inject(descrip, frm, len(frm))
if err < 0:
plib.Pcap_close(descrip)
print "Error: pcap_inject failed"
return -1
if sent != None:
sent.set()
plib.Pcap_close(descrip)
return 0