+++ /dev/null
-#
-# (Generic) Netlink message generation/parsing
-# Copyright (c) 2007 Johannes Berg <johannes@sipsolutions.net>
-# Copyright (c) 2014 Intel Corporation
-#
-# This software may be distributed under the terms of the BSD license.
-# See README for more details.
-
-import struct, socket
-
-# flags
-NLM_F_REQUEST = 1
-NLM_F_MULTI = 2
-NLM_F_ACK = 4
-NLM_F_ECHO = 8
-
-# types
-NLMSG_NOOP = 1
-NLMSG_ERROR = 2
-NLMSG_DONE = 3
-NLMSG_OVERRUN = 4
-NLMSG_MIN_TYPE = 0x10
-
-class Attr(object):
- def __init__(self, attr_type, data, *values):
- self._type = attr_type
- if len(values):
- self._data = struct.pack(data, *values)
- else:
- self._data = data
-
- def _dump(self):
- hdr = struct.pack("HH", len(self._data) + 4, self._type)
- length = len(self._data)
- pad = ((length + 4 - 1) & ~3 ) - length
- return hdr + self._data + '\0' * pad
-
- def __repr__(self):
- return '<Attr type %d, data "%s">' % (self._type, repr(self._data))
-
- def u16(self):
- return struct.unpack('H', self._data)[0]
- def s16(self):
- return struct.unpack('h', self._data)[0]
- def u32(self):
- return struct.unpack('I', self._data)[0]
- def s32(self):
- return struct.unpack('i', self._data)[0]
- def str(self):
- return self._data
- def nulstr(self):
- return self._data.split('\0')[0]
- def nested(self):
- return parse_attributes(self._data)
-
-class StrAttr(Attr):
- def __init__(self, attr_type, data):
- Attr.__init__(self, attr_type, "%ds" % len(data), data)
-
-class NulStrAttr(Attr):
- def __init__(self, attr_type, data):
- Attr.__init__(self, attr_type, "%dsB" % len(data), data, 0)
-
-class U32Attr(Attr):
- def __init__(self, attr_type, val):
- Attr.__init__(self, attr_type, "I", val)
-
-class U8Attr(Attr):
- def __init__(self, attr_type, val):
- Attr.__init__(self, attr_type, "B", val)
-
-class FlagAttr(Attr):
- def __init__(self, attr_type):
- Attr.__init__(self, attr_type, "")
-
-class Nested(Attr):
- def __init__(self, attr_type, attrs):
- self.attrs = attrs
- self.type = attr_type
-
- def _dump(self):
- contents = []
- for attr in self.attrs:
- contents.append(attr._dump())
- contents = ''.join(contents)
- length = len(contents)
- hdr = struct.pack("HH", length+4, self.type)
- return hdr + contents
-
-NETLINK_ROUTE = 0
-NETLINK_UNUSED = 1
-NETLINK_USERSOCK = 2
-NETLINK_FIREWALL = 3
-NETLINK_INET_DIAG = 4
-NETLINK_NFLOG = 5
-NETLINK_XFRM = 6
-NETLINK_SELINUX = 7
-NETLINK_ISCSI = 8
-NETLINK_AUDIT = 9
-NETLINK_FIB_LOOKUP = 10
-NETLINK_CONNECTOR = 11
-NETLINK_NETFILTER = 12
-NETLINK_IP6_FW = 13
-NETLINK_DNRTMSG = 14
-NETLINK_KOBJECT_UEVENT = 15
-NETLINK_GENERIC = 16
-
-class Message(object):
- def __init__(self, msg_type, flags=0, seq=-1, payload=None):
- self.type = msg_type
- self.flags = flags
- self.seq = seq
- self.pid = -1
- payload = payload or []
- if isinstance(payload, list):
- contents = []
- for attr in payload:
- contents.append(attr._dump())
- self.payload = ''.join(contents)
- else:
- self.payload = payload
-
- def send(self, conn):
- if self.seq == -1:
- self.seq = conn.seq()
-
- self.pid = conn.pid
- length = len(self.payload)
-
- hdr = struct.pack("IHHII", length + 4*4, self.type,
- self.flags, self.seq, self.pid)
- conn.send(hdr + self.payload)
-
- def __repr__(self):
- return '<netlink.Message type=%d, pid=%d, seq=%d, flags=0x%x "%s">' % (
- self.type, self.pid, self.seq, self.flags, repr(self.payload))
-
- @property
- def ret(self):
- assert self.type == NLMSG_ERROR
- return struct.unpack("i", self.payload[:4])[0]
-
- def send_and_recv(self, conn):
- self.send(conn)
- while True:
- m = conn.recv()
- if m.seq == self.seq:
- return m
-
-class Connection(object):
- def __init__(self, nltype, groups=0, unexpected_msg_handler=None):
- self.descriptor = socket.socket(socket.AF_NETLINK,
- socket.SOCK_RAW, nltype)
- self.descriptor.setsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF, 65536)
- self.descriptor.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, 65536)
- self.descriptor.bind((0, groups))
- self.pid, self.groups = self.descriptor.getsockname()
- self._seq = 0
- self.unexpected = unexpected_msg_handler
- def send(self, msg):
- self.descriptor.send(msg)
- def recv(self):
- contents = self.descriptor.recv(16384)
- # XXX: python doesn't give us message flags, check
- # len(contents) vs. msglen for TRUNC
- msglen, msg_type, flags, seq, pid = struct.unpack("IHHII",
- contents[:16])
- msg = Message(msg_type, flags, seq, contents[16:])
- msg.pid = pid
- if msg.type == NLMSG_ERROR:
- import os
- errno = msg.ret
- if errno < 0:
- err = OSError("Netlink error: %s (%d)" % (
- os.strerror(-errno), -errno))
- err.errno = -errno
- raise err
- return msg
- def seq(self):
- self._seq += 1
- return self._seq
-
-def parse_attributes(data):
- attrs = {}
- while len(data):
- attr_len, attr_type = struct.unpack("HH", data[:4])
- attrs[attr_type] = Attr(attr_type, data[4:attr_len])
- attr_len = ((attr_len + 4 - 1) & ~3 )
- data = data[attr_len:]
- return attrs
-
-
-
-CTRL_CMD_UNSPEC = 0
-CTRL_CMD_NEWFAMILY = 1
-CTRL_CMD_DELFAMILY = 2
-CTRL_CMD_GETFAMILY = 3
-CTRL_CMD_NEWOPS = 4
-CTRL_CMD_DELOPS = 5
-CTRL_CMD_GETOPS = 6
-
-CTRL_ATTR_UNSPEC = 0
-CTRL_ATTR_FAMILY_ID = 1
-CTRL_ATTR_FAMILY_NAME = 2
-CTRL_ATTR_VERSION = 3
-CTRL_ATTR_HDRSIZE = 4
-CTRL_ATTR_MAXATTR = 5
-CTRL_ATTR_OPS = 6
-
-class GenlHdr(object):
- def __init__(self, cmd, version = 0):
- self.cmd = cmd
- self.version = version
- def _dump(self):
- return struct.pack("BBxx", self.cmd, self.version)
-
-def _genl_hdr_parse(data):
- return GenlHdr(*struct.unpack("BBxx", data))
-
-GENL_ID_CTRL = NLMSG_MIN_TYPE
-
-class GenlMessage(Message):
- def __init__(self, family, cmd, attrs=[], flags=0):
- Message.__init__(self, family, flags=flags, payload=[GenlHdr(cmd)] + attrs)
-
-class GenlController(object):
- def __init__(self, conn):
- self.conn = conn
- def get_family_id(self, family):
- a = NulStrAttr(CTRL_ATTR_FAMILY_NAME, family)
- m = GenlMessage(GENL_ID_CTRL, CTRL_CMD_GETFAMILY, flags=NLM_F_REQUEST, attrs=[a])
- m.send(self.conn)
- m = self.conn.recv()
- gh = _genl_hdr_parse(m.payload[:4])
- attrs = parse_attributes(m.payload[4:])
- return attrs[CTRL_ATTR_FAMILY_ID].u16()
-
-genl_controller = GenlController(Connection(NETLINK_GENERIC))
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