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- """Routing Information Protocol."""
- from pypacker import pypacker, triggerlist
- import logging
- logger = logging.getLogger("pypacker")
- # RIP v2 - RFC 2453
- # http://tools.ietf.org/html/rfc2453
- REQUEST = 1
- RESPONSE = 2
- class RIP(pypacker.Packet):
- __hdr__ = (
- ("cmd", "B", REQUEST),
- ("v", "B", 2),
- ("rsvd", "H", 0),
- ("rte_auth", None, triggerlist.TriggerList)
- )
- def _dissect(self, buf):
- self._init_triggerlist("rte_auth", buf[4:], self.__parse_auths)
- return len(buf)
- def __parse_auths(self, buf):
- off = 0
- auths = []
- while off + 20 <= len(buf):
- if buf[off: off + 2] == b"\xff\xff":
- auth_rte = Auth(buf[off: off + 20])
- else:
- auth_rte = RTE(buf[off: off + 20])
- # logger.debug("RIP: adding auth/rte: %s" % auth_rte)
- auths.append(auth_rte)
- off += 20
- return auths
- class RTE(pypacker.Packet):
- __hdr__ = (
- ("family", "H", 2),
- ("route_tag", "H", 0),
- ("addr", "I", 0),
- ("subnet", "I", 0),
- ("next_hop", "I", 0),
- ("metric", "I", 1)
- )
- class Auth(pypacker.Packet):
- __hdr__ = (
- ("rsvd", "H", 0xFFFF),
- ("type", "H", 2),
- ("auth", "16s", b"\x00" * 16)
- )
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