#!/usr/bin/env python3
# Unix SMB/CIFS implementation.
# Tests for smbcquotas
# Copyright (C) Noel Power 2017

# This program 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.

# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

import os, subprocess, sys
import traceback
import logging
import shutil

USER_QUOTAS = 1
USER_DEFAULT_QUOTAS = 2
GROUP_QUOTAS = 3
GROUP_DEFAULT_QUOTAS = 4
BLOCK_SIZE = 1024
DEFAULT_SOFTLIM = 2
DEFAULT_HARDLIM = 4

class test_env:
	def __init__(self):
		self.server = None
		self.domain = None
		self.username = None
		self.password = None
		self.envdir = None
		self.quota_db = None
		self.smbcquotas = None
		self.users = []

class user_info:
	def __init__(self):
		self.uid = 0
		self.username = ""
		self.softlim = 0
		self.hardlim = 0

class Quota:
	def __init__(self):
		self.flags = 0
		self.quotatype = USER_DEFAULT_QUOTAS
		self.uid = 0
		self.usedblocks = 0
		self.softlimit = 0
		self.hardlimit = 0
		self.hardlimit = 0
		self.usedinodes = 0
		self.slimitinodes = 0
		self.hlimitinodes = 0

def init_quota_db(users, output_file):
	filecontents = open(output_file,"w+")
	lines = ""
	default_values = "0 " + str(DEFAULT_SOFTLIM) + " " + str(DEFAULT_HARDLIM) + " 0 0 0"
	for user in users:
		lines = lines + user.uid + " " + default_values + "\n"
	filecontents.write(lines)
	filecontents.close()

def load_quotas(input_file):
	fileContents = open(input_file,"r")
	lineno = 0
	quotas = []
	for line in fileContents:
		if line.strip().startswith("#"):
			continue
		content = line.strip().split()
		quota = Quota()
		if len(content) < 7:
			logging.debug("ignoring line %d, doesn't have enough fields\n"%lineno)
		else:
			quota.flags = 2
			quota.uid = content[0]
			quota.usedblocks = content[1]
			quota.softlimit = content[2]
			quota.hardlimit = content[3]
			quota.usedinodes = content[4]
			quota.slimitinodes = content[5]
			quota.hlimitinodes = content[6]
			quotas.append(quota)

	fileContents.close()
	return quotas

def get_quotas(uid, quota_list):
	for quota in quota_list:
		if quota.uid == uid:
			return quota
	return None

def get_users():
	output = subprocess.Popen(['getent', 'passwd'],
                                 stdout=subprocess.PIPE).communicate()[0].decode("utf-8").split('\n')
	users = []
	for line in output:
		info = line.split(':')
		if len(info) > 3 and info[0]:
			user = user_info()
			user.username = info[0]
			user.uid = info[2]
			logging.debug("Adding user ->%s<-\n"%user.username)
			users.append(user)
	return users



def smbcquota_output_to_userinfo(output):
	infos = []
	for line in output:
		if len(line) > 1:
			username = line.strip(':').split()[0]
			quota_info = line.split(':')[1].split('/')
			if len(quota_info) > 2:
				info = user_info()
				info.username = username.strip()
				info.softlim = int(quota_info[1].strip()) / BLOCK_SIZE
				info.hardlim = int(quota_info[2].strip()) / BLOCK_SIZE
				infos.append(info)
	return infos

def check_quota_limits(infos, softlim, hardlim):
	if len(infos) < 1:
		logging.debug("no users info to check :-(\n")
		return False
	for info in infos:
		if int(info.softlim) != softlim:
			logging.debug("expected softlimit %s got ->%s<-\n"%(softlim, info.softlim))
			return False
		if int(info.hardlim) != hardlim:
			logging.debug("expected hardlimit limit %s got %s\n"%(hardlim,info.hardlim))
			return False
	return True

class test_base:
	def __init__(self, env):
		self.env = env
	def run(self, protocol):
		pass

class listtest(test_base):
	def run(self, protocol):
		init_quota_db(self.env.users, self.env.quota_db)
		quotas = load_quotas(self.env.quota_db)
		args = [self.env.smbcquotas];
		remaining_args = ['-U' + self.env.username + "%" + self.env.password, '-L', '//' + self.env.server + '/quotadir']
		if protocol == 'smb2':
			args.append('-m smb2')
		args.extend(remaining_args)
		output = subprocess.Popen([self.env.smbcquotas, '-U' + self.env.username + "%" + self.env.password, '-L', '//' + self.env.server + '/quotadir'], stdout=subprocess.PIPE).communicate()[0].decode("utf-8").split('\n')
		infos = smbcquota_output_to_userinfo(output)
		return check_quota_limits(infos, DEFAULT_SOFTLIM, DEFAULT_HARDLIM)
def get_uid(name, users):
	for user in users:
		if user.username == name:
			return user.uid
	return None

class gettest(test_base):
	def run(self, protocol):
		init_quota_db(self.env.users, self.env.quota_db)
		quotas = load_quotas(self.env.quota_db)
		uid = get_uid(self.env.username, self.env.users)
		output = subprocess.Popen([self.env.smbcquotas, '-U' + self.env.username + "%" + self.env.password, '-u' + self.env.username, '//' + self.env.server + '/quotadir'], stdout=subprocess.PIPE).communicate()[0].decode("utf-8").split('\n')
		user_infos = smbcquota_output_to_userinfo(output)
		db_user_info = get_quotas(uid, quotas)
		# double check, we compare the results from the db file
		# the quota script the server uses compared to what
		# smbcquota is telling us
		return check_quota_limits(user_infos, int(db_user_info.softlimit), int(db_user_info.hardlimit))

class settest(test_base):
	def run(self, protocol):
		init_quota_db(self.env.users, self.env.quota_db)
		quotas = load_quotas(self.env.quota_db)
		uid = get_uid(self.env.username, self.env.users)
		old_db_user_info = get_quotas(uid, quotas)

		#increase limits by 2 blocks
		new_soft_limit = (int(old_db_user_info.softlimit) + 2) * BLOCK_SIZE
		new_hard_limit = (int(old_db_user_info.hardlimit) + 2) * BLOCK_SIZE

		new_limits = "UQLIM:%s:%d/%d"%(self.env.username, new_soft_limit, new_hard_limit)
		logging.debug("setting new limits %s"%new_limits)

		output = subprocess.Popen([self.env.smbcquotas, '-U' + self.env.username + "%" + self.env.password, '//' + self.env.server + '/quotadir', '-S', new_limits], stdout=subprocess.PIPE).communicate()[0].decode("utf-8").split('\n')
		logging.debug("output from smbcquota is %s"%output)
		user_infos = smbcquota_output_to_userinfo(output)
		return check_quota_limits(user_infos, new_soft_limit / BLOCK_SIZE, new_hard_limit / BLOCK_SIZE)

# map of tests
subtest_descriptions = {
	"list test" : listtest,
	"get test" : gettest,
	"set test" : settest
}

def main():
	logging.basicConfig(format='%(asctime)s %(message)s', level=logging.DEBUG)

	logging.debug("got args %s\n"%str(sys.argv))

	if len(sys.argv) < 7:
		logging.debug ("Usage: test_smbcquota.py server domain username password envdir smbcquotas\n")
		sys.exit(1)
	env = test_env()
	env.server = sys.argv[1]
	env.domain = sys.argv[2]
	env.username = sys.argv[3]
	env.password = sys.argv[4]
	env.envdir = sys.argv[5]
	env.smbcquotas = sys.argv[6]
	quota_script = os.path.join(os.path.dirname(sys.argv[0]),
				"getset_quota.py")
	#copy the quota script to the evironment
	shutil.copy2(quota_script, env.envdir)

	env.quota_db = os.path.join(env.envdir, "quotas.db")
	env.users = get_users()
	for protocol in ['smb1', 'smb2']:
		for key in subtest_descriptions.keys():
			test = subtest_descriptions[key](env)
			logging.debug("running subtest '%s' using protocol '%s'\n"%(key,protocol))
			result = test.run(protocol)
			if result == False:
				logging.debug("subtest '%s' for '%s' failed\n"%(key,protocol))
				sys.exit(1)
			else:
				logging.debug("subtest '%s' for '%s' passed\n"%(key,protocol))
	sys.exit(0)

if __name__ == '__main__':
    main()
