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- """Point-to-Point Protocol."""
- from pypacker import pypacker, triggerlist
- import logging
- import struct
- logger = logging.getLogger("pypacker")
- # http://www.iana.org/assignments/ppp-numbers
- PPP_IP = 0x21 # Internet Protocol
- PPP_IP6 = 0x57 # Internet Protocol v6
- # Protocol field compression
- PFC_BIT = 0x01
- class PPP(pypacker.Packet):
- __hdr__ = (
- ("p", None, triggerlist.TriggerList),
- )
- def _dissect(self, buf):
- offset = 1
- ppp_type = buf[0]
- if buf[0] & PFC_BIT == 0:
- ppp_type = struct.unpack(">H", buf[:2])[0]
- offset = 2
- self.p.append(buf[0:2])
- else:
- self.p.append(buf[0:1])
- self._init_handler(ppp_type, buf[offset:])
- return offset
- # load handler
- from pypacker.layer3 import ip, ip6
- pypacker.Packet.load_handler(PPP,
- {
- PPP_IP: ip.IP,
- PPP_IP6: ip6.IP6
- }
- )
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