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import struct
from functools import partial
from pyroute2.netlink import NLMSG_DONE, nlmsg
from pyroute2.netlink.exceptions import NetlinkError
from pyroute2.netlink.rtnl import RTM_NEWROUTE
from pyroute2.netlink.rtnl.rtmsg import rtmsg
def get_header(data, offset):
# get message header
header = dict(
zip(
('length', 'type', 'flags', 'sequence_number'),
struct.unpack_from('IHHI', data, offset),
)
)
header['error'] = None
return header
def msg_done(header):
msg = nlmsg()
msg['header'] = header
msg.length = msg['header']['length']
return msg
def _export_routes(fd, data, offset, length):
'''Export RTM_NEWROUTE messages binary data.
Otherwise return NLMSG_DONE.
'''
header = get_header(data, offset)
if header['type'] == NLMSG_DONE:
return msg_done(header)
elif header['type'] == RTM_NEWROUTE:
fd.write(data[offset : offset + length])
return
raise NetlinkError()
def export_routes(fd):
return partial(_export_routes, fd)
def default_routes(data, offset, length):
'''
Only for RTM_NEWROUTE.
This parser returns:
* rtmsg() -- only for default routes (no RTA_DST)
* nlmsg() -- NLMSG_DONE
* None for any other messages
'''
header = get_header(data, offset)
if header['type'] == NLMSG_DONE:
return msg_done(header)
# skip to NLA: offset + nlmsg header + rtmsg data
cursor = offset + 28
# iterate NLA, if meet RTA_DST -- return None (not a default route)
while cursor < offset + length:
nla_length, nla_type = struct.unpack_from('HH', data, cursor)
nla_length = (nla_length + 3) & ~3 # align, page size = 4
cursor += nla_length
if nla_type == 1:
return
# no RTA_DST, a default route -- spend time to decode using the
# standard routine
msg = rtmsg(data, offset=offset)
msg.decode()
msg['header']['error'] = None # required
return msg