pymin/services/ip/__init__.py

   1 # vim: set encoding=utf-8 et sw=4 sts=4 :
   2
   3 from subprocess import Popen, PIPE
   4 from os import path
   5
   6 from pymin.seqtools import Sequence
   7 from pymin.dispatcher import handler, HandlerError, Handler
   8 from pymin.services.util import Restorable, ConfigWriter, InitdHandler, \
   9                                 TransactionalHandler, SubHandler, call, \
  10                                 get_network_devices, ListComposedSubHandler, \
  11                                 DictComposedSubHandler
  12
  13 __ALL__ = ('IpHandler',)
  14
  15 # TODO: convertir HopHandler a ComposedSubHandler
  16
  17 class HopError(HandlerError):
  18
  19     def __init__(self, hop):
  20         self.message = u'Hop error : "%s"' % hop
  21
  22 class HopNotFoundError(HopError):
  23
  24     def __init__(self, hop):
  25         self.message = u'Hop not found : "%s"' % hop
  26
  27 class HopAlreadyExistsError(HopError):
  28
  29     def __init__(self, hop):
  30         self.message = u'Hop already exists : "%s"' % hop
  31
  32
  33 class Hop(Sequence):
  34
  35     def __init__(self, gateway, device):
  36         self.gateway = gateway
  37         self.device = device
  38
  39     def as_tuple(self):
  40         return (self.gateway, self.device)
  41
  42     def __cmp__(self, other):
  43         if self.gateway == other.gateway \
  44                 and self.device == other.device:
  45             return 0
  46         return cmp(id(self), id(other))
  47
  48 class HopHandler(Handler):
  49
  50     def __init__(self, parent):
  51         self.parent = parent
  52
  53     @handler('Adds a hop : add <gateway> <device>')
  54     def add(self, gw, dev):
  55         if not dev in self.parent.devices:
  56             raise DeviceNotFoundError(device)
  57         h = Hop(gw, dev)
  58         try:
  59             self.parent.hops.index(h)
  60             raise HopAlreadyExistsError(gw  + '->' + dev)
  61         except ValueError:
  62             self.parent.hops.append(h)
  63
  64     @handler(u'Deletes a hop : delete <gateway> <device>')
  65     def delete(self, gw, dev):
  66         if not dev in self.parent.devices:
  67             raise DeviceNotFoundError(device)
  68         h = Hop(gw, dev)
  69         try:
  70             self.parent.hops.remove(h)
  71         except ValueError:
  72             raise HopNotFoundError(gw + '->' + dev)
  73
  74     @handler(u'Lists hops : list <dev>')
  75     def list(self, device):
  76         try:
  77             k = self.parent.hops.keys()
  78         except ValueError:
  79             k = list()
  80         return k
  81
  82     @handler(u'Get information about all hops: show <dev>')
  83     def show(self, device):
  84         try:
  85             k = self.parent.hops.values()
  86         except ValueError:
  87             k = list()
  88         return k
  89
  90 class Route(Sequence):
  91     def __init__(self, net_addr, prefix, gateway):
  92         self.net_addr = net_addr
  93         self.prefix = prefix
  94         self.gateway = gateway
  95     def update(self, net_addr=None, prefix=None, gateway=None):
  96         if net_addr is not None: self.net_addr = net_addr
  97         if prefix is not None: self.prefix = prefix
  98         if gateway is not None: self.gateway = gateway
  99     def as_tuple(self):
 100         return(self.net_addr, self.prefix, self.gateway)
 101
 102 class RouteHandler(ListComposedSubHandler):
 103     handler_help = u"Manage IP routes"
 104     _comp_subhandler_cont = 'devices'
 105     _comp_subhandler_attr = 'routes'
 106     _comp_subhandler_class = Route
 107
 108 class Address(Sequence):
 109     def __init__(self, ip, netmask, broadcast=None):
 110         self.ip = ip
 111         self.netmask = netmask
 112         self.broadcast = broadcast
 113     def as_tuple(self):
 114         return (self.ip, self.netmask, self.broadcast)
 115
 116 class AddressHandler(DictComposedSubHandler):
 117     handler_help = u"Manage IP addresses"
 118     _comp_subhandler_cont = 'devices'
 119     _comp_subhandler_attr = 'addrs'
 120     _comp_subhandler_class = Address
 121
 122 class Device(Sequence):
 123     def __init__(self, name, mac):
 124         self.name = name
 125         self.mac = mac
 126         self.addrs = dict()
 127         self.routes = list()
 128     def as_tuple(self):
 129         return (self.name, self.mac)
 130
 131 class DeviceHandler(SubHandler):
 132
 133     handler_help = u"Manage network devices"
 134
 135     def __init__(self, parent):
 136         # FIXME remove templates to execute commands
 137         from mako.template import Template
 138         self.parent = parent
 139         template_dir = path.join(path.dirname(__file__), 'templates')
 140         dev_fn = path.join(template_dir, 'device')
 141         self.device_template = Template(filename=dev_fn)
 142
 143     @handler(u'Bring the device up')
 144     def up(self, name):
 145         if name in self.parent.devices:
 146             call(self.device_template.render(dev=name, action='up'), shell=True)
 147         else:
 148             raise DeviceNotFoundError(name)
 149
 150     @handler(u'Bring the device down')
 151     def down(self, name):
 152         if name in self.parent.devices:
 153             call(self.device_template.render(dev=name, action='down'), shell=True)
 154         else:
 155             raise DeviceNotFoundError(name)
 156
 157     @handler(u'List all devices')
 158     def list(self):
 159         return self.parent.devices.keys()
 160
 161     @handler(u'Get information about a device')
 162     def show(self):
 163         return self.parent.devices.items()
 164
 165 class IpHandler(Restorable, ConfigWriter, TransactionalHandler):
 166
 167     handler_help = u"Manage IP devices, addresses, routes and hops"
 168
 169     _persistent_attrs = ('devices','hops')
 170
 171     _restorable_defaults = dict(
 172                             devices=dict((dev, Device(dev, mac))
 173                                 for (dev, mac) in get_network_devices().items()),
 174                             hops = list()
 175                             )
 176
 177     _config_writer_files = ('device', 'ip_add', 'ip_del', 'ip_flush',
 178                             'route_add', 'route_del', 'route_flush', 'hop')
 179     _config_writer_tpl_dir = path.join(path.dirname(__file__), 'templates')
 180
 181     def __init__(self, pickle_dir='.', config_dir='.'):
 182         r"Initialize DhcpHandler object, see class documentation for details."
 183         self._persistent_dir = pickle_dir
 184         self._config_writer_cfg_dir = config_dir
 185         self._config_build_templates()
 186         self._restore()
 187         self._write_config()
 188         self.addr = AddressHandler(self)
 189         self.route = RouteHandler(self)
 190         self.dev = DeviceHandler(self)
 191         self.hop = HopHandler(self)
 192
 193     def _write_config(self):
 194         r"_write_config() -> None :: Execute all commands."
 195         for device in self.devices.values():
 196             call(self._render_config('route_flush', dict(dev=device.name)), shell=True)
 197             call(self._render_config('ip_flush', dict(dev=device.name)), shell=True)
 198             for address in device.addrs.values():
 199                 broadcast = address.broadcast
 200                 if broadcast is None:
 201                     broadcast = '+'
 202                 call(self._render_config('ip_add', dict(
 203                         dev = device.name,
 204                         addr = address.ip,
 205                         netmask = address.netmask,
 206                         broadcast = broadcast,
 207                     )
 208                 ), shell=True)
 209             for route in device.routes:
 210                 call(self._render_config('route_add', dict(
 211                         dev = device.name,
 212                         net_addr = route.net_addr,
 213                         prefix = route.prefix,
 214                         gateway = route.gateway,
 215                     )
 216                 ), shell=True)
 217
 218         if self.hops:
 219             call('ip route del default', shell=True)
 220             call(self._render_config('hop', dict(
 221                         hops = self.hops,
 222                     )
 223                  ), shell=True)
 224
 225
 226     def handle_timer(self):
 227         self.refresh_devices()
 228
 229
 230     def refresh_devices(self):
 231         devices = get_network_devices()
 232         #add not registered devices
 233         for k,v in devices.items():
 234             if k not in self.devices:
 235                 self.devices[k] = Device(k,v)
 236         #delete dead devices
 237         for k in self.devices.keys():
 238             if k not in devices:
 239                 del self.devices[k]
 240
 241
 242
 243 if __name__ == '__main__':
 244
 245     ip = IpHanlder()
 246     print '----------------------'
 247     ip.hop.add('201.21.32.53','eth0')
 248     ip.hop.add('205.65.65.25','eth1')
 249     ip.commit()
 250     ip.dev.up('eth0')
 251     ip.addr.add('eth0','192.168.0.23','24','192.168.255.255')
 252     ip.addr.add('eth0','192.168.0.26','24')
 253     ip.commit()
 254     ip.route.add('eth0','192.168.0.0','24','192.168.0.1')
 255     ip.route.add('eth0','192.168.0.5','24','192.168.0.1')
 256     ip.commit()
 257     ip.hop.delete('201.21.32.53','eth0')
 258     ip.route.clear('eth0')
 259     ip.commit()
 260
 261
 262