def print_hdr(ofd, msg):
"""https://github.com/thom311/libnl/blob/libnl3_2_25/lib/msg.c#L793.
Positional arguments:
ofd -- function to call with arguments similar to `logging.debug`.
msg -- message to print (nl_msg class instance).
"""
nlh = nlmsg_hdr(msg)
buf = bytearray()
ofd(' .nlmsg_len = %d', nlh.nlmsg_len)
ops = nl_cache_ops_associate_safe(msg.nm_protocol, nlh.nlmsg_type)
if ops:
mt = nl_msgtype_lookup(ops, nlh.nlmsg_type)
if not mt:
raise BUG
buf.extend('{0}::{1}'.format(ops.co_name, mt.mt_name).encode('ascii'))
else:
nl_nlmsgtype2str(nlh.nlmsg_type, buf, 128)
ofd(' .type = %d <%s>', nlh.nlmsg_type, buf.decode('ascii'))
ofd(' .flags = %d <%s>', nlh.nlmsg_flags, nl_nlmsg_flags2str(nlh.nlmsg_flags, buf, 128).decode('ascii'))
ofd(' .seq = %d', nlh.nlmsg_seq)
ofd(' .port = %d', nlh.nlmsg_pid)
def callback(_, msg_):
nlh = nlmsg_hdr(msg_)
assert 20 == nlh.nlmsg_len
assert 16 == nlh.nlmsg_type
assert 5 == nlh.nlmsg_flags
ops = nl_cache_ops_associate_safe(NETLINK_GENERIC, nlh.nlmsg_type)
assert 'genl/family' == ops.co_name
assert 4 == ops.co_hdrsize
assert 16 == ops.co_protocol
assert 0 == ops.co_hash_size
assert 0 == ops.co_flags
assert 'genl/family' == ops.co_obj_ops.oo_name
assert 80 == ops.co_obj_ops.oo_size
assert 1 == ops.co_obj_ops.oo_id_attrs
assert 0 == nlmsg_attrlen(nlh, ops.co_hdrsize)
mt = nl_msgtype_lookup(ops, nlh.nlmsg_type)
assert 16 == mt.mt_id
assert 0 == mt.mt_act
assert 'nlctrl' == mt.mt_name
called.append(True)
return NL_STOP
def callback(_, msg_):
nlh = nlmsg_hdr(msg_)
assert 20 == nlh.nlmsg_len
assert 16 == nlh.nlmsg_type
assert 5 == nlh.nlmsg_flags
ops = nl_cache_ops_associate_safe(NETLINK_GENERIC, nlh.nlmsg_type)
assert 'genl/family' == ops.co_name
assert 4 == ops.co_hdrsize
assert 16 == ops.co_protocol
assert 0 == ops.co_hash_size
assert 0 == ops.co_flags
assert 'genl/family' == ops.co_obj_ops.oo_name
assert 80 == ops.co_obj_ops.oo_size
assert 1 == ops.co_obj_ops.oo_id_attrs
assert 0 == nlmsg_attrlen(nlh, ops.co_hdrsize)
mt = nl_msgtype_lookup(ops, nlh.nlmsg_type)
assert 16 == mt.mt_id
assert 0 == mt.mt_act
assert 'nlctrl' == mt.mt_name
called.append(True)
return NL_STOP
