def get_channelinfo(channel_bytes):
"""
return -- [channel_mhz, channel_flags]
"""
return [
unpack_H_le(channel_bytes[0:2])[0],
unpack_H_le(channel_bytes[2:4])[0]
]
def _dissect(self, buf):
# Needed by _parse_flags()
self.present_flags = unpack_I(buf[4:8])[0]
#logger.debug("Flags: 0x%X" % flags)
pos_end = len(buf)
# Check for FSC, needs to be skipped for upper layers
if self.present_flags & FLAGS_MASK == FLAGS_MASK:
#logger.debug("Flags mask matched")
flags_off = 8
# TSFT present -> Flags values are after TSFT value
if self.present_flags & TSFT_MASK == TSFT_MASK:
flags_off = 8 + 8
if buf[flags_off] & 0x10 != 0:
#logger.debug("FCS found")
self._fcs = buf[-4:]
pos_end = -4
hdr_len = unpack_H_le(buf[2:4])[0]
#logger.debug("Bytes for flags (%d): %s" % (hdr_len, buf[8: hdr_len]))
self._init_triggerlist("flags", buf[8: hdr_len], self._parse_flags)
#logger.debug("rtap bytes:=%r" % buf[:hdr_len])
# now we got the correct header length
self._init_handler(RTAP_TYPE_80211, buf[hdr_len: pos_end])
#logger.debug("Adding %d flags" % len(self.flags))
return hdr_len
def _dissect(self, buf):
typeinfo_be = unpack_H_le(buf[1:3])[0]
hlen = 5
# VS_PL_LNK_STATUS does not have frag
if typeinfo_be in {0xA0B8, 0xA0B9}:
# logger.debug("disabling frag")
self.frag_info = None
self.frag_seq = None
hlen = 3
# logger.debug("Got type %X", typeinfo_be)
self._init_handler(typeinfo_be, buf[hlen:])
return hlen
def in_cksum_add(s, buf):
"""Add checksum value to the given value s. Adds 0x0 padding if not multiple of 2."""
n = len(buf)
# logger.debug("buflen for checksum: %d" % n)
# len=123 -> len=122
a = array_call("H", buf[:n & (~0x1)])
if ENDIANNES != "little":
a.byteswap()
if n & 0x1 == 0x1:
# not multiple of 2: add padding
a.append(unpack_H_le(buf[-1:] + b"\x00")[0])
return s + sum(a)
def in_cksum_add(s, buf):
"""return -- s + checksum value of buf. Adds 0x0 padding to buf if not multiple of 2."""
buflen = len(buf)
# logger.debug("buflen for checksum: %d" % n)
#a = [unpack_H_le(buf[off: off+2])[0] for off in range(0, buflen & ~0x1, 2)] # seems to be slower
a = array_call("H", buf[:buflen & ~0x1])
if ENDIANNES_IS_BIG:
a.byteswap()
if buflen & 0x1 == 0x1:
# not multiple of 2: add padding
a.append(unpack_H_le(buf[-1:] + b"\x00")[0])
return s + sum(a)
def _dissect(self, buf):
flags = self._present_flags = unpack_I(buf[4:8])[0]
pos_end = len(buf)
if flags & FLAGS_MASK == FLAGS_MASK:
off = 0
if flags & TSFT_MASK == TSFT_MASK:
off = 8
if buf[off] & 0x10 != 0:
#logger.debug("fcs found")
self._fcs = buf[-4:]
pos_end = -4
hdr_len = unpack_H_le(buf[2:4])[0]
#logger.debug("hdr length is: %d" % hdr_len)
self._init_triggerlist("flags", buf[8:hdr_len], self._parse_flags)
#logger.debug("rtap bytes:=%r" % buf[:hdr_len])
# now we got the correct header length
self._init_handler(RTAP_TYPE_80211, buf[hdr_len:pos_end])
#logger.debug(adding %d flags" % len(self.flags))
return hdr_len