def parse (self, raw):
assert isinstance(raw, bytes)
self.raw = raw
dlen = len(raw)
if dlen < self.MIN_LEN:
self.msg('(llc parse) warning: packet data too short')
return
self.length = 3
(self.dsap, self.ssap, self.control) \
= struct.unpack('!BBB', raw[:self.MIN_LEN])
if ((self.control & 1) == 0) or ((self.control & 3) == 2):
if dlen < self.length + 1:
self.msg('(llc parse) warning: packet data too short')
return
self.control |= (ord(raw[3:4]) << 8)
self.length = 4
if (self.ssap & 0xfe) == 0xaa:
if (self.dsap & 0xfe) == 0xaa:
# Oh snap
if dlen < self.length + 5:
self.msg('(llc parse) warning: incomplete SNAP')
return
self.oui = raw[self.length:self.length+3]
self.length += 3
self.eth_type = struct.unpack("!H", raw[self.length:self.length+2])[0]
self.length += 2
self.parsed = True
self.next = ethernet.parse_next(self, self.eth_type, raw, self.length,
allow_llc = False)
def parse(self, raw):
assert isinstance(raw, bytes)
self.raw = raw
dlen = len(raw)
if dlen < vlan.MIN_LEN:
self.msg("(vlan parse) warning VLAN packet data too short to " + "parse header: data len %u" % (dlen,))
return
(pcpid, self.eth_type) = struct.unpack("!HH", raw[: vlan.MIN_LEN])
self.pcp = pcpid >> 13
self.cfi = pcpid & 0x1000
self.id = pcpid & 0x0FFF
self.parsed = True
self.next = ethernet.parse_next(self, self.eth_type, raw, vlan.MIN_LEN)
def parse(self, raw):
assert isinstance(raw, bytes)
self.raw = raw
dlen = len(raw)
if dlen < vlan.MIN_LEN:
self.msg('(vlan parse) warning VLAN packet data too short to ' +
'parse header: data len %u' % (dlen, ))
return
(pcpid, self.eth_type) = struct.unpack("!HH", raw[:vlan.MIN_LEN])
self.pcp = pcpid >> 13
self.cfi = pcpid & 0x1000
self.id = pcpid & 0x0fff
self.parsed = True
self.next = ethernet.parse_next(self, self.eth_type, raw, vlan.MIN_LEN)
def parse(self, raw):
assert isinstance(raw, bytes)
self.raw = raw
dlen = len(raw)
if dlen < self.MIN_LEN:
self.msg('(llc parse) warning: packet data too short')
return
self.length = 3
(self.dsap, self.ssap, self.control) \
= struct.unpack('!BBB', raw[:self.MIN_LEN])
if ((self.control & 1) == 0) or ((self.control & 3) == 2):
if dlen < self.length + 1:
self.msg('(llc parse) warning: packet data too short')
return
self.control |= (ord(raw[3:4]) << 8)
self.length = 4
if (self.ssap & 0xfe) == 0xaa:
if (self.dsap & 0xfe) == 0xaa:
# Oh snap
if dlen < self.length + 5:
self.msg('(llc parse) warning: incomplete SNAP')
return
self.oui = raw[self.length:self.length + 3]
self.length += 3
self.eth_type = struct.unpack(
"!H", raw[self.length:self.length + 2])[0]
self.length += 2
self.parsed = True
if self.oui == '\0\0\0':
self.next = ethernet.parse_next(self,
self.eth_type,
raw,
self.length,
allow_llc=False)
else:
self.next = raw[self.length:]
