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# kpov_util should be imported by add_assignment.py
# TODO: finish this.
instructions = {
'si': '''\
<p>
Postavi tri navidezne računalnike: <em>SimpleArbiter</em>, <em>SNMPServer</em> in <em>SNMPClient</em>.
<p>
Napiši program <code>upminutes</code>, ki bo izpisal v minutah, koliko časa je racunalnik vklopljen. Postavi ga na <em>SNMPClient</em> v domači imenik uporabnika <code>test</code> z geslom <code>test</code>.
<p>
Poskrbi, da bo strežnik SNMP pod OID
<pre><code>{{SNMP_UPTIME_OID}}</code></pre>
<p>
sporočal, koliko časa je vklopljen v sekundah.
<p>
Napiši skripto, poimenovano <code>beri.sh</code>, ki prek SNMP prebere vrednost s <em>simpleArbiterDhcpGWSNMP</em> na OID
<pre><code>{{SNMP_CLIENT_OID}}</code></pre>
<p>
kot član skupnosti <code>testers</code>. Postavi jo na <em>SNMPClient</em>, v domači imenik uporabnika <code>test</code>. Poskrbi, da bodo podatki na SNMPServer dostopni za skupino (angl. <em lang="en">community</em>) <code>studentje</code>.
''',
'en': '''\
<p>
Set up three virtual computers: <em>SimpleArbiter</em>, <em>SNMPServer</em> and <em>SNMPClient</em>.
<p>
Write a program called <code>upminutes</code>. This program should output the uptime of the computer in minutes. Set it up on <em>SNMPClient</em> in the home directory of the user <code>test</code> with the password <code>test</code>.
<p>
Make sure that the SNMP server reports its uptime in seconds over SNMP under OID
<pre><code>{{SNMP_UPTIME_OID}}</code></pre>
<p>
Write a script called <code>beri.sh</code> that reads the value from the OID
<pre><code>{{SNMP_CLIENT_OID}}</code></pre>
<p>
on <em>simpleArbiterDhcpGWSNMP</em> as a member of the community <code>testers</code>. Set it up on <em>SNMPClient</em> in the home directory of the user <code>test</code>. Make all the data available over SNMP readable by the community <code>studentje</code>.
''',
}
computers = {
'SNMPClient': {
'disks': [
{ 'name': 'student-SNMPClient',
},
],
'network_interfaces': [{'network': 'net1'}],
'flavor': 'm1.tiny',
'config_drive': False
},
'SNMPServer': {
'disks': [
{ 'name': 'student-SNMPServer',
},
],
'network_interfaces': [{'network': 'net1'}],
'flavor': 'm1.tiny',
'config_drive': False
},
'SimpleArbiter': {
'disks': [
{ 'name': 'simpleArbiterDhcpGWSNMP',
},
],
'network_interfaces': [{'network': 'net1'}, {'network': 'test-net'}],
'flavor': 'm1.tiny',
'config_drive': False
}
}
networks = { 'net1': {'public': False}, 'test-net': {'public': True} }
params_meta = {
'SNMP_VALUE': {'descriptions': {'si': 'Vrednost, dostopna prek SNMP', 'en': 'The value available over SNMP'}, 'w': False, 'public':False, 'type': 'short', 'generated': True},
'SNMP_UPTIME_OID': {'descriptions': {'si': 'SNMP_UPTIME_OID (za uptime)', 'en': 'SNMP_UPTIME_OID (for the uptime)'}, 'w': False, 'public':True, 'type': 'str', 'generated': True},
'SNMP_CLIENT_OID': {'descriptions': {'si': 'SNMP_CLIENT_OID, ki naj ga klient bere', 'en':'The OID that the client should read'}, 'w': False, 'public':True, 'type': 'OID', 'generated': True},
'SERVER_IP': {'descriptions': {'si': 'IP SNMP strežnika', 'en':'IP of the SNMP server'}, 'w': True, 'public':True, 'type': 'IP', 'generated': False},
'CLIENT_IP': {'descriptions': {'si': 'IP SNMP klienta', 'en': 'IP of the SNMP client'}, 'w': True, 'public':True, 'type': 'IP', 'generated': False},
}
def task(SERVER_IP, CLIENT_IP, SNMP_UPTIME_OID, SNMP_CLIENT_OID):
#<== Aleksander Fujs 6310020 ==>
# TODO popravi IPje
import netsnmp
import paramiko
from paramiko import SSHClient
return_results = {}
client = SSHClient()
client.load_system_host_keys()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
client.connect(SERVER_IP, username='student', password='vaje')
stdin, stdout, stderr = client.exec_command('uptime=$(</proc/uptime); uptime=${uptime%%.*}; echo $uptime')
return_results['server_uptime'] = stdout.read()
try:
session = netsnmp.Session(DestHost=SERVER_IP, Version=2, Community='studentje')
# results_objs = netsnmp.VarList(netsnmp.Varbind(SNMP_UPTIME_OID)) #117.112.116.105.109.101 <-uptime
results_objs = netsnmp.VarList(netsnmp.Varbind('.1.3.6.1.4.1.8072.1.3.2.4.1.2')) #117.112.116.105.109.101 <-uptime
session.walk(results_objs)
result_list = []
for result in results_objs:
result_list.append('{}.{}: {}'.format(
result.tag, result.iid, result.val))
return_results['server_OID'] = "\n".join(result_list)
except Exception as exception_error:
# Check for errors and print out results
print(('ERROR: Occurred during SNMPget for OID %s from %s: '
'(%s)') % (SNMP_UPTIME_OID, CLIENT_IP, exception_error))
sys.exit(2)
client.connect(CLIENT_IP, username='test', password='test')
stdin, stdout, stderr = client.exec_command('uptime=$(</proc/uptime); uptime=${uptime%%.*}; echo $(( uptime ))')
return_results['client_uptime'] = stdout.read()
# zakaj bi morala biti ravno bash skripta?
stdin, stdout, stderr = client.exec_command('/home/test/upminutes')
#TODO preverit da ni v skripti hardcodan
return_results['client_script'] = stdout.read()
stdin, stdout, stderr = client.exec_command('/home/test/beri.sh')
return_results['client_script2'] = stdout.read()
#TODO add 3 part of assigement
return return_results
#<== Aleksander Fujs 6310020 ==>
def gen_params(user_id, params_meta):
import random
params = dict()
r = random.Random(user_id)
# You can also create an OID creation function in kpov_util.
# this should probably return params_meta
#<== Aleksander Fujs 6310020 ==>
params['SNMP_VALUE'] = kpov_util.alnum_gen(r, 64)
params['SNMP_UPTIME_OID'] = 'NET-SNMP-EXTEND-MIB::nsExtendOutLine."{}".1'.format(
kpov_util.hostname_gen(r))
params['SNMP_CLIENT_OID'] = '1.3.6.1.4.1.8072.2.9999.9999.{}'.format(
r.randint(0, 255))
#<== Aleksander Fujs 6310020 ==>
return params
def task_check(results, params):
#TODO improve regex
import re
score = 0
hints = []
client_script_uptime = int(results['client_script'].strip())
client_uptime = int(results['client_uptime'].strip())
d = client_uptime - client_script_uptime*60
if d >= 0 and d < 62:
score += 3
else:
hints += ["client uptime script output wrong."]
server_uptime = int(results['server_uptime'].strip())
lines = results['server_OID'].split('\n')
unique_part_start = params['SNMP_UPTIME_OID'].find('"')
unique_part_end = params['SNMP_UPTIME_OID'].find('"', unique_part_start+1)
unique_part = params['SNMP_UPTIME_OID'][unique_part_start+1:unique_part_end]
server_oid = 'iso.3.6.1.4.1.8072.1.3.2.4.1.2.{}.'.format(len(unique_part))
server_oid += '.'.join([str(ord(i)) for i in unique_part]) + '.1.'
found_uptime = False
for line in lines:
try:
oid, uptime_s = line.split(':')
d = server_uptime - int(uptime_s.strip())
if oid.strip() == server_oid and d >= -2 and d <= 5:
found_uptime = True
break
except Exception as e:
pass
if len(lines) <= 50 and found_uptime:
score += 3
else:
hints += ["Uptime not found in server's MDB"]
if results['client_script2'].find(params['SNMP_VALUE']) >= 0:
score += 4
else:
hints += ["beri.sh not working properly"]
return score, hints
def prepare_disks(templates, task_params, global_params):
# d = templates['simpleArbiterDhcp']
prog = """#!/usr/bin/python
import sys
action = sys.argv[1]
oid = sys.argv[2]
foo_oid = ".{oid}"
foo_oid_start = foo_oid[:foo_oid.rfind('.')]
foo_oid_end = foo_oid[len(foo_oid_start)+1:]
oid_end = oid[len(foo_oid_start)+1:]
oid_start = oid[:len(foo_oid_start)]
if action == '-n' and (
(oid_start == foo_oid_start) and (
(len(oid_end) == 0) or (int(oid_end) < int(foo_oid_end))
)
):
oid = foo_oid
if action != '-s' and oid == foo_oid:
print foo_oid
print "string"
print "{val}"
""".format(oid = task_params['SNMP_CLIENT_OID'], val = task_params['SNMP_VALUE'])
templates['simpleArbiterDhcpGWSNMP'].write('/usr/local/bin/snmpext.py', prog)
templates['simpleArbiterDhcpGWSNMP'].chmod(0o755, '/usr/local/bin/snmpext.py')
write_default_config(templates['simpleArbiterDhcpGWSNMP'], global_params)
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