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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# kpov_random_helpers should be imported by add_assignment.py
# TODO: finish this!
instructions = {
'si':u"""
Postavite dva navidezna racunalnika:
- SimpleArbiterDhcpRdate s slike diska simpleArbiterRdate ter
- rdateClient.
Na rdateClient ustvarite uporabnika test z geslom test. Nastavite cas na
rdateClient tako, da kot rdate strežnik uporabite SimpleArbiterDhcpRdate.
Nato v domacem imeniku uporabnika test ustvarite program z imenom
{PROGRAM_FILENAME}.
Program naj prebere 4 byte podatkov s standardnega vhoda in jih pretvori v
predznaceno celo število, pri čemer naj uporablja zapis z debelim koncem
(big endian).
Število naj program izpiše na standardni izhod v obliki niza.
""",
'en':u"""
Setup two virtual machines:
- SimpleArbiterDhcpRdate from disk image simpleArbiterRdate and
- rdateClient.
On rdateClient, create a user with the username test and password test.
Set the time on rdateClient using rdate with SimpleArbiterDhcpRdate as
the server. Then, write a program called {PROGRAM_FILENAME} and put it in
user test's home directory.
The program should read 4 bytes of data from standard input, convert
them into a signed integer using big endian byte ordering and output the
resulting integer (as a string) to standard output.
"""
}
computers = {
'rdateClient': {
'disks': [
{ 'name': 'student-rdate',
},
#{ 'name': 'CDROM',
# 'options':{'readonly': True},
# 'parts': [],# no parts, no mounting.
#}
],
'network_interfaces': [{'network': 'net1'}],
'flavor': 'm1.tiny',
'config_drive': False
},
'SimpleArbiter': {
'disks': [
{ 'name': 'simpleArbiterDhcpGWRdate',
# 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} }
# Tu sem dolocil parametre
params_meta = {
'RDATE_OFFSET':{'descriptions': {'si': 'Napaka v času pri rdate'}, 'w': False, 'public': False, 'type': 'integer', 'generated': True},
'PROGRAM_FILENAME':{'descriptions': {'si': 'Ime programa'}, 'w': False, 'public': True, 'type': 'integer', 'generated': True},
'IP_RDATECLIENT':{'descriptions': {'si': 'IP rdateClient'}, 'w': True, 'public': False, 'type': 'IP', 'generated': False},
}
def task(IP_RDATECLIENT, PROGRAM_FILENAME):
import pexpect
import paramiko
from paramiko import SSHClient
import random
import struct
results = dict()
peer_user = 'test'
peer_passwd = 'test'
client = SSHClient()
client.load_system_host_keys()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
client.connect(IP_RDATECLIENT, username=peer_user, password=peer_passwd)
#client.login(IP_RDATECLIENT, peer_user, peer_passwd)
r = random.Random(PROGRAM_FILENAME)
for i in xrange(10):
stdin, stdout, stderr = client.exec_command(
'~/{}'.format(PROGRAM_FILENAME))
data = struct.pack("!I", r.randint(0, 2**32))
stdin.write(data)
results['in_' + str(i)] = data
results['out_' + str(i)] = stdout.read()
stdin, stdout, stderr = client.exec_command(
'date -u +"%s"')
#client.sendline('date -u "%s"')
#client.prompt()
results['date'] = stdout.read()
results['ldate'] = pexpect.run('date -u +"%s"')
client.close()
return results
#Dolocil sem tri parametre in sicer jih lahko vidite v prams_meta,
#zato prosim da jih upostevate v naslednih nalogah.
def gen_params(user_id, params_meta):
import socket
import struct
import datetime
params = dict()
r = random.Random(user_id)
params['PROGRAM_FILENAME'] = kpov_random_helpers.fname_gen(r, False)
params['RDATE_OFFSET'] = str(r.randint(-2**24, 2**24))
return params
def task_check(results, params):
import random
import struct
# print results
r = random.Random(params['PROGRAM_FILENAME'])
score = 0.0
hints = []
for i in xrange(10):
data = results['in_' + str(i)]
if data != struct.pack("!I", r.randint(0, 2**32)):
break
res = results['out_' + str(i)]
if str(struct.unpack("!I", data)[0]) == res.strip():
score += 0.5
else:
hints += ["wrong convert"]
# print str(struct.unpack("!I", data)[0]), res.strip()
if abs(int(results['ldate']) + \
int(params['RDATE_OFFSET']) - int(results['date'])) < 3:
score += 5
else:
hints += ["wrong offset"]
return score, hints
def prepare_disks(templates, task_params, global_params):
# d = templates['simpleArbiterDhcp']
# print templates
# print params
d = templates['simpleArbiterDhcpGWRdate']
s1 = """service "time_tcp" {{
enabled yes;
protocol tcp;
port "time";
user "nobody";
exec "/usr/local/bin/kpovrdate {RDATE_OFFSET}";
server "/usr/sbin/tcpd";
wait no;
}}
""".format(**task_params)
d.write('/etc/rlinetd.d/time', s1)
s2 = """#!/usr/bin/python
import struct
import time
import sys
offset = int(sys.argv[1])
t = time.time() + 2208988800 + offset
sys.stdout.write(struct.pack("!I", int(t)))
"""
d.write('/usr/local/bin/kpovrdate', s2)
d.chmod(0775, '/usr/local/bin/kpovrdate')
write_default_config(templates['simpleArbiterDhcpGWRdate'], global_params)
|
