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# coding: utf-8
# nslcd.py - functions for doing nslcd requests
#
# Copyright (C) 2013-2019 Arthur de Jong
#
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
import fcntl
import os
import socket
import struct
import sys
import constants
# definition for reading and writing INT32 values
_int32 = struct.Struct('!i')
class NslcdClient(object):
def __init__(self, action):
# set up the socket (store in class to avoid closing it)
self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
fcntl.fcntl(self.sock, fcntl.F_SETFD, fcntl.FD_CLOEXEC)
# connect to nslcd
self.sock.connect(constants.NSLCD_SOCKET)
# self.sock.setblocking(1)
self.fp = os.fdopen(self.sock.fileno(), 'r+b', 0)
# write a request header with a request code
self.action = action
self.write_int32(constants.NSLCD_VERSION)
self.write_int32(action)
def write(self, value):
self.fp.write(value)
def write_int32(self, value):
self.write(_int32.pack(value))
def write_bytes(self, value):
self.write_int32(len(value))
if value:
self.write(value)
def write_string(self, value):
if sys.version_info[0] >= 3:
value = value.encode('utf-8')
self.write_bytes(value)
def write_ether(self, value):
value = struct.pack('BBBBBB', *(int(x, 16) for x in value.split(':')))
self.write(value)
def write_address(self, af, value):
self.write_int32(af)
self.write_bytes(value)
def read(self, size):
value = b''
while len(value) < size:
data = self.fp.read(size - len(value))
if not data:
raise IOError('NSLCD protocol cut short')
value += data
return value
def read_int32(self):
return _int32.unpack(self.read(_int32.size))[0]
def read_bytes(self):
return self.read(self.read_int32())
def read_string(self):
value = self.read_bytes()
if sys.version_info[0] >= 3:
value = value.decode('utf-8')
return value
def read_stringlist(self):
num = self.read_int32()
return [self.read_string() for x in range(num)]
def read_ether(self):
value = self.fp.read(6)
return ':'.join('%x' % x for x in struct.unpack('6B', value))
def read_address(self):
af = self.read_int32()
return af, socket.inet_ntop(af, self.read_bytes())
def read_addresslist(self):
num = self.read_int32()
return [self.read_address() for x in range(num)]
def get_response(self):
# complete the request if required and check response header
if self.action:
# flush the stream
self.fp.flush()
# read and check response version number
if self.read_int32() != constants.NSLCD_VERSION:
raise IOError('NSLCD protocol error')
if self.read_int32() != self.action:
raise IOError('NSLCD protocol error')
# reset action to ensure that it is only the first time
self.action = None
# get the NSLCD_RESULT_* marker and return it
return self.read_int32()
def close(self):
if hasattr(self, 'fp'):
try:
self.fp.close()
except IOError:
pass
def __del__(self):
self.close()
def usermod(username, asroot=False, password=None, args=None):
# open a connection to nslcd
con = NslcdClient(constants.NSLCD_ACTION_USERMOD)
# write the request information
con.write_string(username)
con.write_int32(1 if asroot else 0)
con.write_string(password)
for k, v in args.items():
con.write_int32(k)
con.write_string(v)
con.write_int32(constants.NSLCD_USERMOD_END)
# read the response
if con.get_response() != constants.NSLCD_RESULT_BEGIN:
raise IOError('NSLCD protocol error')
response = {}
while True:
key = con.read_int32()
if key == constants.NSLCD_USERMOD_END:
break
response[key] = con.read_string()
# return the response
return response
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