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# Copyright 2019 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
import os
from subprocess import Popen, PIPE, STDOUT
from vyos.ifconfig.register import Register
class Control(Register):
_command_get = {}
_command_set = {}
def _debug_msg(self, msg):
if os.path.isfile('/tmp/vyos.ifconfig.debug'):
print('DEBUG/{:<6} {}'.format(self.config['ifname'], msg))
def _popen(self, command):
p = Popen(command, stdout=PIPE, stderr=STDOUT, shell=True)
tmp = p.communicate()[0].strip()
self._debug_msg(f"cmd '{command}'")
decoded = tmp.decode()
if decoded:
self._debug_msg(f"returned:\n{decoded}")
return decoded, p.returncode
def _cmd(self, command):
decoded, code = self._popen(command)
if code != 0:
# error code can be recovered with .errno
raise OSError(code, f'{command}\nreturned: {decoded}')
return decoded
def _get_command(self, config, name):
"""
Using the defined names, set data write to sysfs.
"""
cmd = self._command_get[name]['shellcmd'].format(**config)
return self._command_get[name].get('format', lambda _: _)(self._cmd(cmd))
def _set_command(self, config, name, value):
"""
Using the defined names, set data write to sysfs.
"""
# the code can pass int as int
value = str(value)
validate = self._command_set[name].get('validate', None)
if validate:
try:
validate(value)
except Exception as e:
raise e.__class__(f'Could not set {name}. {e}')
convert = self._command_set[name].get('convert', None)
if convert:
value = convert(value)
config = {**config, **{'value': value}}
cmd = self._command_set[name]['shellcmd'].format(**config)
return self._command_set[name].get('format', lambda _: _)(self._cmd(cmd))
_sysfs_get = {}
_sysfs_set = {}
def _read_sysfs(self, filename):
"""
Provide a single primitive w/ error checking for reading from sysfs.
"""
value = None
with open(filename, 'r') as f:
value = f.read().rstrip('\n')
self._debug_msg("read '{}' < '{}'".format(value, filename))
return value
def _write_sysfs(self, filename, value):
"""
Provide a single primitive w/ error checking for writing to sysfs.
"""
self._debug_msg("write '{}' > '{}'".format(value, filename))
if os.path.isfile(filename):
with open(filename, 'w') as f:
f.write(str(value))
return True
return False
def _get_sysfs(self, config, name):
"""
Using the defined names, get data write from sysfs.
"""
filename = self._sysfs_get[name]['location'].format(**config)
if not filename:
return None
return self._read_sysfs(filename)
def _set_sysfs(self, config, name, value):
"""
Using the defined names, set data write to sysfs.
"""
# the code can pass int as int
value = str(value)
validate = self._sysfs_set[name].get('validate', None)
if validate:
validate(value)
config = {**config, **{'value': value}}
convert = self._sysfs_set[name].get('convert', None)
if convert:
value = convert(value)
commited = self._write_sysfs(
self._sysfs_set[name]['location'].format(**config), value)
if not commited:
errmsg = self._sysfs_set.get('errormsg', '')
if errmsg:
raise TypeError(errmsg.format(**config))
return commited
def get_interface(self, name):
if name in self._sysfs_get:
return self._get_sysfs(self.config, name)
if name in self._command_get:
return self._get_command(self.config, name)
raise KeyError(f'{name} is not a attribute of the interface we can get')
def set_interface(self, name, value):
if name in self._sysfs_set:
return self._set_sysfs(self.config, name, value)
if name in self._command_set:
return self._set_command(self.config, name, value)
raise KeyError(f'{name} is not a attribute of the interface we can set')
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