/usr/lib/python2.7/dist-packages/framework/cxnet/netlink/generic.py is in fso-frameworkd 0.10.1-3.
This file is owned by root:root, with mode 0o644.
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Generic Netlink protocol implementation
"""
# Copyright (c) 2007-2008 ALT Linux, Peter V. Saveliev
#
# This file is part of Connexion project.
#
# Connexion is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# Connexion is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Connexion; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
from ctypes import *
from cxnet.common import *
from socket import AF_NETLINK, SOCK_RAW
from os import getpid
## Netlink family
#
NETLINK_ROUTE = 0 # Routing/device hook
NETLINK_UNUSED = 1 # Unused number
NETLINK_USERSOCK = 2 # Reserved for user mode socket protocols
NETLINK_FIREWALL = 3 # Firewalling hook
NETLINK_INET_DIAG = 4 # INET socket monitoring
NETLINK_NFLOG = 5 # netfilter/iptables ULOG
NETLINK_XFRM = 6 # ipsec
NETLINK_SELINUX = 7 # SELinux event notifications
NETLINK_ISCSI = 8 # Open-iSCSI
NETLINK_AUDIT = 9 # auditing
NETLINK_FIB_LOOKUP = 10
NETLINK_CONNECTOR = 11
NETLINK_NETFILTER = 12 # netfilter subsystem
NETLINK_IP6_FW = 13
NETLINK_DNRTMSG = 14 # DECnet routing messages
NETLINK_KOBJECT_UEVENT = 15 # Kernel messages to userspace
NETLINK_GENERIC = 16
# leave room for NETLINK_DM (DM Events)
NETLINK_SCSITRANSPORT = 18 # SCSI Transports
## Netlink message flags values (nlmsghdr.flags)
#
NLM_F_REQUEST = 1 # It is request message.
NLM_F_MULTI = 2 # Multipart message, terminated by NLMSG_DONE
NLM_F_ACK = 4 # Reply with ack, with zero or error code
NLM_F_ECHO = 8 # Echo this request
# Modifiers to GET request
NLM_F_ROOT = 0x100 # specify tree root
NLM_F_MATCH = 0x200 # return all matching
NLM_F_ATOMIC = 0x400 # atomic GET
NLM_F_DUMP = (NLM_F_ROOT|NLM_F_MATCH)
# Modifiers to NEW request
NLM_F_REPLACE = 0x100 # Override existing
NLM_F_EXCL = 0x200 # Do not touch, if it exists
NLM_F_CREATE = 0x400 # Create, if it does not exist
NLM_F_APPEND = 0x800 # Add to end of list
NLMSG_NOOP = 0x1 # Nothing
NLMSG_ERROR = 0x2 # Error
NLMSG_DONE = 0x3 # End of a dump
NLMSG_OVERRUN = 0x4 # Data lost
NLMSG_MIN_TYPE = 0x10 # < 0x10: reserved control messages
NLMSG_MAX_LEN = 0x1000# Max message length
# 8<--------------------------------------------------------
#
# structures for recvmsg(2) support
#
class iov(Structure):
_fields_ = [
("buf",cx_int),
("size",cx_int),
]
class rmsg(Structure):
_fields_ = [
("sa_addr",cx_int),
("sa_size",cx_int),
("iov_addr",cx_int),
("x1",cx_int),
("x2",cx_int),
("x3",cx_int),
("x4",cx_int),
]
# 8<--------------------------------------------------------
class nlmsghdr(Structure):
"""
Generic Netlink message header
"""
_fields_ = [
("length", c_uint32),
("type", c_uint16),
("flags", c_uint16),
("sequence_number", c_uint32),
("pid", c_uint32),
]
class nlmsg(Structure):
"""
Generic Netlink message structure
"""
_fields_ = [
("hdr", nlmsghdr),
("data", c_byte * NLMSG_MAX_LEN),
]
class sockaddr(Structure):
"""
Sockaddr structure, see bind(2)
"""
_fields_ = [
("family", c_ushort),
("pad", c_ushort),
("pid", c_uint32),
("groups", c_uint32),
]
class nl_socket(object):
"""
Generic Netlink socket
"""
fd = None # socket file descriptor
msg = nlmsg # message pattern
def __init__(self, family=NETLINK_GENERIC, groups=0):
"""
Create and bind socket structure
"""
self.fd = libc.socket(AF_NETLINK,SOCK_RAW,family)
sa = sockaddr()
sa.family = AF_NETLINK
sa.pid = getpid()
sa.groups = groups
l = libc.bind(self.fd, byref(sa), sizeof(sa))
if l != 0:
self.close()
raise Exception("libc.bind(): errcode %i" % (l))
def close(self):
"""
Close the socket
"""
libc.close(self.fd)
def recv(self):
"""
Receive a packet from Netlink socket (using recvfrom(2))
"""
msg = self.msg()
l = libc.recvfrom(self.fd, byref(msg), sizeof(msg), 0, 0, 0)
if l == -1:
msg = None
return (l,msg)
def recv2(self):
"""
Receive a packet from Netlink socket (using recvmsg(2))
"""
buf = self.msg()
i = iov(addressof(buf),sizeof(buf))
sa = sockaddr()
msg = rmsg(addressof(sa),sizeof(sa),addressof(i),1,0,0,0)
l = libc.recvmsg(self.fd, byref(msg), 0)
if l == -1:
msg = None
return (l,buf)
def send(self, msg, size=0):
"""
Send a packet through Netlink socket
"""
if not size:
size = sizeof(msg)
sa = sockaddr()
sa.family = AF_NETLINK
sa.pid = 0
self.prepare(msg, size)
l = libc.sendto(self.fd, byref(msg), size, 0, byref(sa), sizeof(sa))
return l
def prepare(self, msg, size=0):
"""
Adjust message header fields before sending
"""
if not size:
size = sizeof(msg)
msg.hdr.length = size
msg.hdr.pid = getpid()
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