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# kpov_util should be imported by add_assignment.py
# Postavi nek film na Internet tako, da ga bodo lahko ostali videli.
# TODO: finish this
instructions = {
'si': '''\
<p>
Postavi navidezni računalnik <em>SimpleArbiter</em> in <em>StudentVLC</em>. Poskrbi, da bosta na istem omrežju, od koder bosta imela dostop tudi do interneta.
<p>
Na <em>StudentVLC</em> posodobi datoteko <code>/etc/apt/sources.list</code>, preveri posodobitve in naloži VLC.
<p>
Posnemi ali kako drugače ustvari film ter poskrbi, da bo film dostopen na lokalnem omrežju prek RTP z imenom toka <code>{{TOK}}</code> na naslovu <code>{{NASLOV}}</code>, vrata <code>{{PORT}}</code>. Računaj, da bodo film lahko videli tvoji sošolci. Kršenje avtorskih pravic je pri reševanju te naloge strogo prepovedano.
''',
'en': '''\
<p>
Set up a virtual computer called <em>SimpleArbiter</em> using the simpleArbiter disk and
a virtual computer called <em>StudentVLC</em> using the student-VLC disk. Make sure they
are on the same network and that they have access to the Internet.
<p>
On StundentVLC, update /etc/apt/sources.list, check the for updates and install VLC.
<p>
Record or otherwise create a movie and make sure the movie is avaliable on your local network via RTP with the name of the stream <code>{{TOK}}</code> at the address <code>{{NASLOV}}</code> on port <code>{{PORT}}</code>. Take into account that the movie may be seen by your classmates. Copyright infrigement while solving this task is strictly prohibited.
''',
}
computers = {
'SimpleArbiter': {
'disks': [
{ 'name': 'simpleArbiter',
},
],
'network_interfaces': [{'network': 'test-net'}],
'flavor': 'm1.tiny',
'config_drive': False
},
'StudentVLC': {
'disks': [
{ 'name': 'student-VLC',
},
],
'network_interfaces': [{'network': 'test-net'}],
'flavor': 'm1.tiny',
'config_drive': False
}
}
networks = { 'test-net': {'public': True} }
params_meta = {
'NASLOV': {'descriptions': {'si': 'RTP multicast IP naslov'}, 'w': False, 'public':True, 'type': 'stream_name', 'generated': True},
'PORT': {'descriptions': {'si': 'RTP VRATA'}, 'w': False, 'public':True, 'type': 'port', 'generated': True},
'TOK': {'descriptions': {'si': 'Naslov (ime) toka'}, 'w': False, 'public':True, 'type': 'IP', 'generated': True},
}
def task(NASLOV, TOK):
import pexpect
results = dict()
results['ps'] = pexpect.run('ps xa')
results['tcpdump_hex'] = pexpect.run('sudo /usr/sbin/tcpdump -x -c 2 dst host 239.255.255.255 and port 9875'.format(NASLOV))
results['tcpdump'] = pexpect.run('sudo /usr/sbin/tcpdump -c 8 dst host {}'.format(NASLOV))
return results
def gen_params(user_id, params_meta):
params = dict()
r = random.Random(user_id)
net = kpov_util.IPv4_net_gen(r, min_hosts = 16,
local=True, multicast=True)
params['NASLOV'] = kpov_util.IPv4_addr_gen(r, net, 1)[0]
params['PORT'] = str(r.randint(5000, 6000))
params['TOK'] = kpov_util.hostname_gen(r)
return params
def task_check(results, params):
import re
score = 0
hints = []
p1_s = ""
sname = ""
try:
packs = results['tcpdump_hex'].split('> 239.255.255.255.9875: UDP, length')
p1 = packs[1]
p1_l = p1.split('\n')
p1_d = p1_l[1:-1]
p1_s = ""
for i in p1_d:
p1_s = p1_s + "".join([j.strip() for j in i.split(' ')[1:]])
sname = "".join([hex(ord(i))[2:] for i in params['TOK']])
except:
hints.append("problem parsing RTP stream capture result")
if p1_s.find(sname) > 2:
score += 5
else:
hints.append("stream name not found in stream announcement")
s = "IP [^ ]* > {}.{}: UDP, length [0-9]+".format(
re.escape(params['NASLOV']),
params['PORT'])
if re.search(s, results['tcpdump']):
score += 5
else:
hints.append("RTP stream not detected in " + results['tcpdump'])
return score, hints
def prepare_disks(templates, task_params, global_params):
write_default_config(templates['simpleArbiter'], global_params)
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