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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# kpov_random_helpers should be imported by add_assignment.py
instructions = {
'si':u"""
Ustvari tri navidezne računalnike. Za enega (SimpleArbiter) uporabi sliko diska simpleArbiter. Na drugega (DHCP_server) postavi strežnika DHCP in DNS in poskrbi, da ta računalnik dobi IP naslov {IP_server}. Poskrbi, da bo preostali računalnik (DHCP_client) dobil naslov {IP_client}, ki mu ga določi DHCP strežnik. Poskrbi še,da DNS strežnik vrne za hostname {HOSTNAME_X} IP naslov {IP_X}.
"""
}
computers = {
'maliNetworkManager': {
'disks': [
{ 'name': 'maliNetworkManager',
},
#{ 'name': 'CDROM',
# 'options':{'readonly': True},
# 'parts': [],# no parts, no mounting.
#}
],
'network_interfaces': [{'network': 'net1'}],
'flavor': 'm1.tiny',
'config_drive': False
},
'maliBrezNetworkManager': {
'disks': [
{ 'name': 'maliBrezNetworkManager',
},
#{ 'name': 'CDROM',
# 'options':{'readonly': True},
# 'parts': [],# no parts, no mounting.
#}
],
'network_interfaces': [{'network': 'net1'}],
'flavor': 'm1.tiny',
'config_drive': False
},
'SimpleArbiter': {
'disks': [
{ 'name': 'simpleArbiterDhcp',
# attempt automount
},
#{ 'name': 'CDROM',
# 'options': {'readonly': True},
# 'parts': [{'dev': 'b1', 'path': '/cdrom'}],
#},
],
'network_interfaces': [{'network': 'net1'}, {'network': 'test-net'}],
'flavor': 'm1.tiny',
'config_drive': False
}
}
networks = { 'net1': {'public': False}, 'test-net': {'public': True} }
params_meta = {
'IP_server': {'descriptions': {'si': 'IP naslov DHCP streznika'}, 'w': False, 'public':True, 'type': 'IP', 'generated': True},
'IP_client': {'descriptions': {'si': 'IP naslov DHCP klienta'}, 'w': False, 'public': True, 'type': 'IP', 'generated': True},
'MAC_client': {'descriptions': {'si': 'MAC naslov DHCP klienta'}, 'w': True, 'public': True, 'type': 'MAC', 'generated': False},
'HOSTNAME_X': {'descriptions': {'si': 'Hostname za DNS'}, 'w': False, 'public': True, 'type': 'short_text', 'generated': True},
'IP_X': {'descriptions': {'si': 'Naslov, ki ga vrne DNS'}, 'w': False, 'public': False, 'type': 'IP', 'generated': True},
}
def task(IP_server, IP_client, MAC_client, HOSTNAME_X):
from pexpect import pxssh
#import pexpect
results = dict()
peer_user = 'student'
peer_passwd = 'vaje'
sA = pxssh.pxssh()
sB = pxssh.pxssh()
#prijavimo se na streznik (IP_NM je IP nalov streznika)
sA.login(IP_server, peer_user, peer_passwd)
#prijavimo se na klienta (IP_static je IP naslov klienta)
sB.login(IP_client, peer_user, peer_passwd)
# tukaj dobimo podatke iz streznika ce je res klientu dodelil pravi naslov
# mogoce tail -5 ni potreben ampak sem razmisljal da bi bilo hitreje, ce bi preverjali samo
# zadnjih 5 DHCPACK vnosov
sA.sendline('sudo grep DHCPACK /var/log/syslog | tail -5')
# in ker gre za sudo ukaz posljemo se geslo uporabnika v tem primeru gre za uporabnika student
sA.sendline(peer_passwd)
sA.prompt()
results['client_IP'] = sA.before
# tukaj dobimo podatke, ce je na IP_NM naslovu res postavljen DHCP streznik
sB.sendline('sudo dhcping -s {} -h {} -c {}'.format(IP_server, MAC_client, IP_client))
sB.sendline(peer_passwd)
sB.prompt()
results['dhcp'] = sB.before
# tukaj pa dobimo podatek, ce je IP, ki ga vraca DNS streznik za HOSTNAME_X pravilen
sB.sendline('nslookup {}'.format(HOSTNAME_X))
sB.prompt()
results['dns_hostname'] = sB.before
sA.logout()
sB.logout()
return results
def gen_params(user_id, params_meta):
params = dict()
r = random.Random(user_id+"bla")
net = kpov_random_helpers.IPv4_subnet_gen(r, '172.23.128.0/18', 24)
params['IP_server'], params['IP_client'], params['IP_X'] = kpov_random_helpers.IPv4_addr_gen(r, net, 3)
params['HOSTNAME_X'] = "".join([r.choice('ABCDEFGHIJKLMNPRSTUVZ') for i in xrange(5)])
return params
def task_check(results, params):
import re
score = 0
hints = []
# ker je v results[dhcp] shranjen ukaz za dobivanje teh podatkov, kot tudi odgovor streznika
# mora biti stevilo pojavitev streznikovega IP naslova (IP_NM) enako ali vecje od 2
# enkrat se zagotovo pojavi v ukazu in nato se mora vsaj se enkrat pojaviti tudi v odgovoru
if results['dhcp'].count(params['IP_server']) >= 2:
score += 2
else:
hints += ["dhcp wrong"]
if results['client_IP'].find("DHCPACK on " + params['IP_client'] + " to " + params['MAC_client']) >= 0:
score += 3
else:
hints += ["client IP wrong"]
if results['dns_hostname'].find(params['IP_X']) >= 0:
score += 5
else:
hints += ['dns wrong']
return score, hints
def prepare_disks(templates, task_params, global_params):
write_default_config(templates['simpleArbiterDhcp'], global_params)
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