# construct header
if ipv6:
header = struct.pack('BbHHh', ICMP_TYPE_IP6, ICMP_CODE, ICMP_CHECKSUM, \
ICMP_ID, ICMP_SEQ_NR+id)
else:
header = struct.pack('bbHHh', ICMP_TYPE, ICMP_CODE, ICMP_CHECKSUM, \
ICMP_ID, ICMP_SEQ_NR+id)
# if size big enough, embed this payload
load = "-- IF YOU ARE READING THIS YOU ARE A NERD! --"
# space for time
size -= struct.calcsize("d")
# construct payload based on size, may be omitted :)
rest = ""
if size >; len(load):
rest = load
size -= len(load)
# pad the rest of payload
rest += size * "X"
# pack
data = struct.pack("d", time.time()) + rest
packet = header + data # ping packet without checksum
checksum = _in_cksum(packet) # make checksum
# construct header with correct checksum
if ipv6:
header = struct.pack('BbHHh', ICMP_TYPE_IP6, ICMP_CODE, checksum, \
ICMP_ID, ICMP_SEQ_NR+id)
else:
header = struct.pack('bbHHh', ICMP_TYPE, ICMP_CODE, checksum, ICMP_ID, \
ICMP_SEQ_NR+id)
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