mirror of
https://github.com/linux-system-roles/network.git
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64 lines
1.8 KiB
Python
64 lines
1.8 KiB
Python
# SPDX-License-Identifier: BSD-3-Clause
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from __future__ import absolute_import, division, print_function
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__metaclass__ = type
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import array
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import struct
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import fcntl
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import socket
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from .utils import Util
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ETHTOOL_GPERMADDR = 0x00000020
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SIOCETHTOOL = 0x8946
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MAX_ADDR_LEN = 32
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IFNAMESIZ = 16
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def get_perm_addr(ifname):
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"""
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Return the Permanent address value for the specified interface using the
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ETHTOOL_GPERMADDR ioctl command.
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Please for further documentation, see:
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wokeignore:rule=master
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https://github.com/torvalds/linux/blob/master/include/uapi/linux/ethtool.h#L734
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wokeignore:rule=master
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https://github.com/torvalds/linux/blob/master/include/uapi/linux/ethtool.h#L1388
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https://git.kernel.org/pub/scm/network/ethtool/ethtool.git/tree/ethtool.c#n4172
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"""
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try:
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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sockfd = sock.fileno()
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ifname = ifname.encode("utf-8")
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if len(ifname) > IFNAMESIZ:
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return None
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ecmd = array.array(
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"B",
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struct.pack(
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"II%is" % MAX_ADDR_LEN,
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ETHTOOL_GPERMADDR,
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MAX_ADDR_LEN,
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b"\x00" * MAX_ADDR_LEN,
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),
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)
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ifreq = struct.pack("%isP" % IFNAMESIZ, ifname, ecmd.buffer_info()[0])
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fcntl.ioctl(sockfd, SIOCETHTOOL, ifreq)
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try:
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res = ecmd.tobytes()
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except AttributeError: # tobytes() is not available in python2
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# pylint: disable=no-member
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res = ecmd.tostring()
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# pylint: enable=no-member
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unused, size, perm_addr = struct.unpack("II%is" % MAX_ADDR_LEN, res)
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perm_addr = Util.mac_ntoa(perm_addr[:size])
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except IOError:
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perm_addr = None
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finally:
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sock.close()
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return perm_addr
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