#!/usr/bin/env python
# vim: set et sw=4 sts=4 :

import sys, os

def get_campos(line):
    r = []
    for c in line.split('\t'):
        r.append(c.strip('"\n'))
    return r

def parse(f):
    hosts = {}
    line = f.readline()
    while line:
        if line.startswith('"tabla de ruteo de '):
            host = line[19:-7]
            hosts[host] = {}
            line = f.readline()
            hosts[host]['ifaces'] = []
            while line and line.strip() <> '"red"\t"ip"\t"mascara"\t"gateway"\t"interfaz"\t"metrica"':
                if line.startswith('"'):
                    (iface, ip, mascara, broadcast, peer) = get_campos(line)[:5]
                    hosts[host]['ifaces'].append({
                        'iface': iface,
                        'ip': ip,
                        'mascara': mascara,
                        'broadcast': broadcast,
                        'peer': peer,
                    })
                line = f.readline()
            line = f.readline()
            hosts[host]['rutas'] = []
            while line and line.strip() <> '"--"':
                if line.startswith('"'):
                    (red, ip, mascara, gateway, iface, metrica) = get_campos(line)
                    if not metrica: metrica = "1"
                    hosts[host]['rutas'].append({
                        'red': red,
                        'ip': ip,
                        'mascara': mascara,
                        'gateway': gateway,
                        'iface': iface,
                        'metrica': metrica,
                        })
                line = f.readline()
        line = f.readline()
    return hosts

def up(host, fd):
    hosts = parse(fd)
    ppp = 0
    for iface in hosts[host]['ifaces']:
        if iface['iface'].startswith('ppp'):
            print 'UP: pppd -detach crtscts lock %(ip)s:%(peer)s /dev/ttyS0' % iface
            os.system('pppd -detach crtscts lock %(ip)s:%(peer)s /dev/ttyS0 &' % iface)
            ppp = 1
        else:
            print 'UP: ifconfig %(iface)s %(ip)s broadcast %(broadcast)s netmask %(mascara)s' % iface
            os.system('ifconfig %(iface)s %(ip)s broadcast %(broadcast)s netmask %(mascara)s' % iface)
    if ppp:
    	print 'while sleep 1; do if ping -c1 %(peer)s 2>&1 > /dev/null; then break; else echo Esperando link ppp...; fi; done' % iface
    	os.system('while sleep 1; do if ping -c1 %(peer)s 2>&1 > /dev/null; then break; else echo Esperando link ppp...; fi; done' % iface)
    for ruta in hosts[host]['rutas']:
        if ruta['metrica'] <> "0":
            print 'UP: route add -net %(ip)s gw %(gateway)s netmask %(mascara)s dev %(iface)s metric %(metrica)s' % ruta
            os.system('route add -net %(ip)s gw %(gateway)s netmask %(mascara)s dev %(iface)s metric %(metrica)s' % ruta)
    os.system('cp /etc/hosts /etc/hosts.13.bak')
    os.system('cp hosts /etc/hosts')
    os.system('cp /etc/networks /etc/networks.13.bak')
    os.system('cp networks /etc/networks')

def down(host, fd):
    hosts = parse(fd)
    for iface in hosts[host]['ifaces']:
        print 'DOWN: ifconfig %(iface)s down' % iface
        if iface['iface'].startswith('ppp'):
            os.system('killall pppd')
        else:
            os.system('ifconfig %(iface)s down' % iface)
    os.system('mv /etc/hosts.13.bak /etc/hosts')
    os.system('mv /etc/networks.13.bak /etc/networks')

def list(fd):
    hosts = parse(fd)
    for host in hosts.keys():
        print host

if __name__ == '__main__':
    fd = file('routers_labo.csv')
    if len(sys.argv) < 2:
        print >>sys.stderr, 'Uso: %s [up|down] host' % sys.argv[0]
        sys.exit(1)
    if sys.argv[1] == 'up':
        up(sys.argv[2], fd)
    elif sys.argv[1] == 'down':
        down(sys.argv[2], fd)
    elif sys.argv[1] == 'restart':
	down(sys.argv[2], fd)
	up(sys.argv[2], file('routers_labo.csv'))
    elif sys.argv[1] == 'list':
        list(fd)