1 files changed, 110 insertions, 0 deletions
diff --git a/tasks/vlc_stream_rtp/task.py b/tasks/vlc_stream_rtp/task.py
new file mode 100644
index 0000000..427fc0e
--- /dev/null
+++ b/tasks/vlc_stream_rtp/task.py
@@ -0,0 +1,110 @@
+# 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)