#!/usr/bin/env python
# -*- coding: utf-8 -*-

# kpov_random_helpers should be imported by add_assignment.py

instructions = {
    'si':u"""
Postavi tri navidezne racunalnike - SimpleArbiter z diska SimpleArbiterVPN ter
VPNClient1 in VPNClient2, ki jima nastavite pravilne mrežne nastavitve (medsebojna povezava in povezava na splet).
Na vse racunalnike namestite OpenVPN in program za nadzor nad virtualnimi napravami (s katerim kreirate napravo tap).
Strežnik SimpleArbiterVPN naj generira skupno skrivnost (*.key),katero shranite v imenik /vpn in jo na VPNCLient uporabite skupaj z konfiguracijsko
datoteko za OpenVPN povezavo. Nato poskrbite, da bo VPNClient na navideznem omrežju prek NFS omogočil
dostop do imenika /home/test/IME_IMENIKA, pri čemer IME_IMENIKA preberite na SimpleArbiter.
V ta imenik skopirajte datoteke, ki so prek SMB dostopne na SimpleArbiter.
"""
}

computers = {
    'SimpleArbiter': {
        'disks': [
            {   'name': 'SimpleArbiterVPN',
                # attempt automount
            },
            #{   'name': 'CDROM',
            #    'options': {'readonly': True},
            #    'parts': [{'dev': 'b1', 'path': '/cdrom'}],
            #},
        ],
        'network_interfaces': [
            {
                'network': 'test-net'
            },
            {
                'network': 'net1'
            }
        ],
        'flavor': 'm1.tiny',
        'config_drive': False
    },
    'VPNClient1': {
        'disks': [
            {   'name': 'VPNClient1',
            },
            #{   'name': 'CDROM',
            #    'options':{'readonly': True},
            #    'parts': [],# no parts, no mounting.
            #}
        ],
        'network_interfaces': [
            {
                'network': 'net1'
            }
        },
        'flavor': 'm1.tiny',
        'config_drive': False

    },
    'VPNClient2': {
        'disks': [
            {   'name': 'VPNClient2',
            },
            #{   'name': 'CDROM',
            #    'options':{'readonly': True},
            #    'parts': [],# no parts, no mounting.
            #}
        ],
        'network_interfaces': [
            {
                'network': 'net1'
            }
        },
        'flavor': 'm1.tiny',
        'config_drive': False

    }
}

networks = {
    'test-net': {
        'public': True
    },
    # Used for the VPN tunnel
    'net1': {
        'public': False
    }
}

params_meta = {
    'IP_SimpleArbiterVPN': {
        'descriptions': {
            'si': 'Naslov SimpleArbiter'
        },
        'w': False,
        'public': True,
        'type': 'IP',
        'generated': True
    },
    'DNS_SimpleArbiterVPN': {
        'descriptions': {
            'si': 'DNS za SimpleArbiter'
        },
        'w': False,
        'public': True,
        'type': 'IP',
        'generated': True
    },
    'IP_VPNClient1': {
        'descriptions': {
            'si': 'Naslov VPNClient1'
        },
        'w': False,
        'public': True,
        'type': 'IP',
        'generated': True
    },
    'DNS_VPNClient1': {
        'descriptions': {
            'si': 'DNS za VPNClient1'
        },
        'w': False,
        'public': True,
        'type': 'IP',
        'generated': True
    },
    'IP_VPNClient2': {
        'descriptions': {
            'si': 'Naslov VPNClient2'
        },
        'w': False,
        'public': True,
        'type': 'IP',
        'generated': True
    },
    'DNS_VPNClient2': {
        'descriptions': {
            'si': 'DNS za VPNClient2'
        },
        'w': False,
        'public': True,
        'type': 'IP',
        'generated': True
    }
}


def task(IP_SimpleArbiterVPN, DNS_SimpleArbiterVPN, IP_VPNClient1, DNS_VPNClient1, IP_VPNClient2, DNS_VPNClient2):
    
    import pxssh    # Used to set up an SSH connection to a remote machine
    #import pexpect  # Allows the script to spawn a child application and control it as if a human were typing commands
    
    
    # the necessary things we need to check if the task was performed correctly
    results = dict()
    
    # The login params (these must be used on the machines!)
    peer_user = 'student'
    peer_passwd = 'vaje'
    
    ###
    # Sets up the SSH connections to the machines
    ###
    # SimpleArbiter
    sA = pxssh.pxssh()
    # VPNClient1
    sC1 = pxssh.pxssh()
    # VPNClient2
    sC2 = pxssh.pxssh()
    
    # Logs in to the machines with the default login params
    sA.login(
        IP_SimpleArbiterVPN,
        peer_user,
        peer_passwd
    )
    sC1.login(
        IP_VPNClient1,
        peer_user,
        peer_passwd
    )
    sC2.login(
        IP_VPNClient2,
        peer_user,
        peer_passwd
    )
    
    
    
    ######
    # sA
    ######
    # TODO: (polz) you can remove nmcli and nslookup - these were only used in the task that
    #   was used as the template for other taps
    # Make sure NM is not handling eth0
    results['SimpleArbiter_nmcli'] = sA.run('nmcli d')
    
    # Get the IP of the network as per a DNS server (used to check if all computers are on the same network)
    results['SimpleArbiter_nslookup'] = sA.run('nslookup www.arnes.si')
    
    # Check if the VPN is set up
    # Returns 1 if ok, else 0
    sA.sendline('ls /sys/class/net/ | grep "tap0"')
    sA.prompt()
    output = sA.before
    output.split('\n')[1]
    results['SimpleArbiter_is_VPN_set_up'] = output
    
    # Check if the VPN server is running
    # Returns 1 if ok, else 0
    sA.sendline('ls /sys/class/net | grep "tun0"')
    sA.prompt()
    output = sA.before
    output.split('\n')[1]
    results['SimpleArbiter_is_VPN_running'] = output
    
    # Pings each of the clients
    # 10.8.0.6 and 10.8.0.10 are the first two default addresses distributed by OpenVPN
    # Will output everything ping outputs (set to ping 3 times)
    sA.sendLine('ping -c 3 10.8.0.6')
    sA.prompt()
    output = sA.before
    results['SimpleArbiter_ping_C1'] = output
    sA.sendLine('ping -c 3 10.8.0.10')
    sA.prompt()
    output = sA.before
    results['SimpleArbiter_ping_C2'] = output
    
    ###
    # Check if both clients are connected to the correct VPN
    # (check if first 24 bits of IP addr are the same as the server's)
    # a.k.a. the YES WE CAN method of checking things
    # really, really hoping it has root privileges too
    ###
    ### Install nmap
    # TODO: (polz) Don't install nmap here - tell me that you
    #   need nmap to be present on simpleArbiter and I'll install it.
    # Check if root
    sA.sendline('id -u')
    sA.prompt()
    uid = sA.before.split('\n')
    uid = uid[1].rstrip()
    #print uid
    # If is isn't root
    if ( uid != "0" ):
        print "SimpleArbiter user must be root to continue with this step (installing nmap mostly)"
    # If it is, we continue
    else:
        ### Install the nmap package
        # Check if nmap is already installed
        sA.sendline('dpkg-query -W nmap')
        sA.prompt()
        lines = sA.before.split('\n')
        line = lines[1]
        # If it isn't
        if ( len(line.rstrip()) == 4 ):  # returns "nmap\r\n" if package isn't installed
            sA.sendline('apt-get install nmap --assume-yes')
        # If it is
        else:
            sA.sendline('')
            #sA.wait()  # For some reason this hangs
            sA.expect(".*#")  # Expecting a new line prompt (root's prompt ends with a #)
            
            # Run nmap on the VPN network
            sA.sendline('nmap -sP 10.8.0.0/24')
            sA.prompt()
            results['SimpleArbiter_nmap_results'] = sA.before
    
    
    
    ######
    # sC1
    ######
    # TODO: (polz) again, no need for this
    results['VPNClient1_nmcli'] = sC1.run('nmcli d')
    
    results['VPNClient1_nslookup'] = sC1.run('nslookup www.arnes.si')
    
    # Ping the VPN server
    sC1.sendLine( 'ping -c 3 {0}'.format( DNS_SimpleArbiterVPN ) )
    sC1.prompt()
    output = sC1.before
    results['VPNClient1_ping_VPN_server'] = output
    
    
    ######
    # sC2
    ######
    
    results['VPNClient2_nmcli'] = sC2.run('nmcli d')
    
    results['VPNClient2_nslookup'] = sC2.run('nslookup www.arnes.si')
    
    # Ping the VPN server
    sC2.sendLine( 'ping -c 3 {0}'.format( DNS_SimpleArbiterVPN ) )
    sC2.prompt()
    output = sC2.before
    results['VPNClient2_ping_VPN_server'] = output
    
    
    
    sA.logout()
    sC1.logout()
    sC2.logout()
    # TODO: (polz) please, add some sort of check to verify that the user created the neccessarry keys.
    # 
    
    return results


def gen_params(user_id, params_meta):
    
    alpha = "abcdefghijklmnoprstuvzxyqw"
    alphaupp = "ABCDEFGHIJKLMNOPRSTUVZQWXY"
    alpha2 = ['$','?','!',"%","&"]
    alpha3 = ['IT','DH','JF','PO','LZ']
    
    
    temp = datetime.datetime.now().strftime("%Y%m%d%H%M%S")
    hash = ""
    
    for x in temp:
    	for i in x:
    		if int(i)<5:
    			hash+=random.choice(alpha)+alpha2[int(i)]
    		else:
    			hash+=random.choice(alphaupp)+alpha3[int(i)-5]
        hash+=":"+temp
    
    
    params = dict()
    
    r = random.Random(user_id)
    
    # IP_NM, DNS_NM, IP_static, DNS_static)
    dns_servers = ['193.2.1.66', '193.2.1.72', '8.8.8.8', '8.8.4.4', '208.67.222.222', '208.67.220.220']
    
    net = kpov_random_helpers.IPv4_subnet_gen(r, '172.23.128.0/18', 24)
    
    params['DNS_NM'] = r.choice(dns_servers)
    params['IP_NM'], params['IP_static'] = kpov_random_helpers.IPv4_addr_gen(r, net, 2)
    params['DNS_static'] = r.choice(dns_servers)
    
    params[user_id] = hash
    
    
    return params


def task_check(results, params):
    
    import re
    #nastavil score na 0 iz -9
    score = 0
    
    if results['NM_nslookup'].find('Server:\t\t{0}\r'.format(params['DNS_NM'])) > -1:
        score += 3
    if results['SimpleArbiter_VPN_is_set_up'] == 1:
        score += 3
    if results['SimpleArbiter_VPN_is_running'] == 1:
	score +=3
   #zal si se nisem prišla na jasno s pingi
   #if results['SimpleArbiter_ping_C1'] .find(Server:\t\t{0}\r'.format(params[])
    if results['static_nslookup'].find('Server:\t\t{0}\r'.format(params['DNS_static'])) > -1:
        score += 3
    if re.search(r'eth0 +802-.*connected', results['NM_nmcli']):
        score += 2
    if not re.search(r'eth0 +802-.*connected', results['static_nmcli']):
        score += 2
   # to stran
   # score = 0
    
    return score


def prepare_disks(templates, params):
    
    #d = templates['simpleArbiterDhcp']
    
    #guestmount -a d -m /dev/VG/LV -m /dev/sda1:/boot --ro /mnt
    #asistent je pocasnela :) 
    
    pass