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 update(self, netmask=None, broadcast=None):
 114         if netmask is not None: self.netmask = netmask
 115         if broadcast is not None: self.broadcast = broadcast
 116     def as_tuple(self):
 117         return (self.ip, self.netmask, self.broadcast)
 118
 119 class AddressHandler(DictComposedSubHandler):
 120     handler_help = u"Manage IP addresses"
 121     _comp_subhandler_cont = 'devices'
 122     _comp_subhandler_attr = 'addrs'
 123     _comp_subhandler_class = Address
 124
 125 class Device(Sequence):
 126     def __init__(self, name, mac):
 127         self.name = name
 128         self.mac = mac
 129         self.addrs = dict()
 130         self.routes = list()
 131     def as_tuple(self):
 132         return (self.name, self.mac)
 133
 134 class DeviceHandler(SubHandler):
 135
 136     handler_help = u"Manage network devices"
 137
 138     def __init__(self, parent):
 139         # FIXME remove templates to execute commands
 140         from mako.template import Template
 141         self.parent = parent
 142         template_dir = path.join(path.dirname(__file__), 'templates')
 143         dev_fn = path.join(template_dir, 'device')
 144         self.device_template = Template(filename=dev_fn)
 145
 146     @handler(u'Bring the device up')
 147     def up(self, name):
 148         if name in self.parent.devices:
 149             call(self.device_template.render(dev=name, action='up'), shell=True)
 150         else:
 151             raise DeviceNotFoundError(name)
 152
 153     @handler(u'Bring the device down')
 154     def down(self, name):
 155         if name in self.parent.devices:
 156             call(self.device_template.render(dev=name, action='down'), shell=True)
 157         else:
 158             raise DeviceNotFoundError(name)
 159
 160     @handler(u'List all devices')
 161     def list(self):
 162         return self.parent.devices.keys()
 163
 164     @handler(u'Get information about a device')
 165     def show(self):
 166         return self.parent.devices.items()
 167
 168 class IpHandler(Restorable, ConfigWriter, TransactionalHandler):
 169
 170     handler_help = u"Manage IP devices, addresses, routes and hops"
 171
 172     _persistent_attrs = ('devices','hops')
 173
 174     _restorable_defaults = dict(
 175                             devices=dict((dev, Device(dev, mac))
 176                                 for (dev, mac) in get_network_devices().items()),
 177                             hops = list()
 178                             )
 179
 180     _config_writer_files = ('device', 'ip_add', 'ip_del', 'ip_flush',
 181                             'route_add', 'route_del', 'route_flush', 'hop')
 182     _config_writer_tpl_dir = path.join(path.dirname(__file__), 'templates')
 183
 184     def __init__(self, pickle_dir='.', config_dir='.'):
 185         r"Initialize DhcpHandler object, see class documentation for details."
 186         self._persistent_dir = pickle_dir
 187         self._config_writer_cfg_dir = config_dir
 188         self._config_build_templates()
 189         self._restore()
 190         self._write_config()
 191         self.addr = AddressHandler(self)
 192         self.route = RouteHandler(self)
 193         self.dev = DeviceHandler(self)
 194         self.hop = HopHandler(self)
 195
 196     def _write_config(self):
 197         r"_write_config() -> None :: Execute all commands."
 198         for device in self.devices.values():
 199             call(self._render_config('route_flush', dict(dev=device.name)), shell=True)
 200             call(self._render_config('ip_flush', dict(dev=device.name)), shell=True)
 201             for address in device.addrs.values():
 202                 broadcast = address.broadcast
 203                 if broadcast is None:
 204                     broadcast = '+'
 205                 call(self._render_config('ip_add', dict(
 206                         dev = device.name,
 207                         addr = address.ip,
 208                         netmask = address.netmask,
 209                         broadcast = broadcast,
 210                     )
 211                 ), shell=True)
 212             for route in device.routes:
 213                 call(self._render_config('route_add', dict(
 214                         dev = device.name,
 215                         net_addr = route.net_addr,
 216                         prefix = route.prefix,
 217                         gateway = route.gateway,
 218                     )
 219                 ), shell=True)
 220
 221         if self.hops:
 222             call('ip route del default', shell=True)
 223             call(self._render_config('hop', dict(
 224                         hops = self.hops,
 225                     )
 226                  ), shell=True)
 227
 228
 229 if __name__ == '__main__':
 230
 231     ip = IpHandler()
 232     print '----------------------'
 233     ip.hop.add('201.21.32.53','eth0')
 234     ip.hop.add('205.65.65.25','eth1')
 235     ip.commit()
 236     ip.dev.up('eth0')
 237     ip.addr.add('eth0','192.168.0.23','24','192.168.255.255')
 238     ip.addr.add('eth0','192.168.0.26','24')
 239     ip.commit()
 240     ip.route.add('eth0','192.168.0.0','24','192.168.0.1')
 241     ip.route.add('eth0','192.168.0.5','24','192.168.0.1')
 242     ip.commit()
 243     ip.hop.delete('201.21.32.53','eth0')
 244     ip.route.clear('eth0')
 245     ip.commit()
 246
 247
 248