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
  10
  11 __ALL__ = ('IpHandler', 'Error','DeviceError', 'DeviceNotFoundError',
  12            'RouteError', 'RouteNotFoundError', 'RouteAlreadyExistsError',
  13            'AddressError', 'AddressNotFoundError', 'AddressAlreadyExistsError')
  14
  15 class Error(HandlerError):
  16     r"""
  17     Error(command) -> Error instance :: Base IpHandler exception class.
  18
  19     All exceptions raised by the IpHandler inherits from this one, so you can
  20     easily catch any IpHandler exception.
  21
  22     message - A descriptive error message.
  23     """
  24     pass
  25
  26 class DeviceError(Error):
  27
  28     def __init__(self, device):
  29         self.message = u'Device error : "%s"' % device
  30
  31 class DeviceNotFoundError(DeviceError):
  32
  33     def __init__(self, device):
  34         self.message = u'Device not found : "%s"' % device
  35
  36 class AddressError(Error):
  37
  38     def __init__(self, addr):
  39         self.message = u'Address error : "%s"' % addr
  40
  41 class AddressNotFoundError(AddressError):
  42
  43     def __init__(self, address):
  44         self.message = u'Address not found : "%s"' % address
  45
  46 class AddressAlreadyExistsError(AddressError):
  47
  48     def __init__(self, address):
  49         self.message = u'Address already exists : "%s"' % address
  50
  51 class RouteError(Error):
  52
  53     def __init__(self, route):
  54         self.message = u'Route error : "%s"' % route
  55
  56 class RouteNotFoundError(RouteError):
  57
  58     def __init__(self, route):
  59         self.message = u'Route not found : "%s"' % route
  60
  61 class RouteAlreadyExistsError(RouteError):
  62
  63     def __init__(self, route):
  64         self.message = u'Route already exists : "%s"' % route
  65
  66
  67 class Route(Sequence):
  68
  69     def __init__(self, net_addr, prefix, gateway):
  70         self.net_addr = net_addr
  71         self.prefix = prefix
  72         self.gateway = gateway
  73
  74     def as_tuple(self):
  75         return(self.addr, self.prefix, self.gateway)
  76
  77     def __cmp__(self, other):
  78         if self.net_addr == other.net_addr \
  79                 and self.prefix == other.prefix \
  80                 and self.gateway == other.gateway:
  81             return 0
  82         return cmp(id(self), id(other))
  83
  84 class RouteHandler(Handler):
  85
  86     handler_help = u"Manage IP routes"
  87
  88     def __init__(self, devices):
  89         self.devices = devices
  90
  91     @handler(u'Adds a route to a device')
  92     def add(self, device, net_addr, prefix, gateway):
  93         if not device in self.devices:
  94             raise DeviceNotFoundError(device)
  95         r = Route(net_addr, prefix, gateway)
  96         try:
  97             self.devices[device].routes.index(r)
  98             raise RouteAlreadyExistsError(net_addr + '/' + prefix + '->' + gateway)
  99         except ValueError:
 100             self.devices[device].routes.append(r)
 101
 102     @handler(u'Deletes a route from a device')
 103     def delete(self, device, net_addr, prefix, gateway):
 104         if not device in self.devices:
 105             raise DeviceNotFoundError(device)
 106         r = Route(net_addr, prefix, gateway)
 107         try:
 108             self.devices[device].routes.remove(r)
 109         except ValueError:
 110             raise RouteNotFoundError(net_addr + '/' + prefix + '->' + gateway)
 111
 112     @handler(u'Flushes routes from a device')
 113     def flush(self, device):
 114         if not device in self.devices:
 115             raise DeviceNotFoundError(device)
 116         self.devices[device].routes = list()
 117
 118
 119     @handler(u'List routes')
 120     def list(self, device):
 121         try:
 122             k = self.devices[device].routes.keys()
 123         except ValueError:
 124             k = list()
 125         return k
 126
 127     @handler(u'Get information about all routes')
 128     def show(self):
 129         try:
 130             k = self.devices[device].routes.values()
 131         except ValueError:
 132             k = list()
 133         return k
 134
 135
 136 class Address(Sequence):
 137
 138     def __init__(self, ip, prefix, broadcast):
 139         self.ip = ip
 140         self.prefix = prefix
 141         self.broadcast = broadcast
 142
 143     def as_tuple(self):
 144         return (self.ip, self.prefix, self.broadcast)
 145
 146 class AddressHandler(Handler):
 147
 148     handler_help = u"Manage IP addresses"
 149
 150     def __init__(self, devices):
 151         self.devices = devices
 152
 153     @handler(u'Adds an address to a device')
 154     def add(self, device, ip, prefix, broadcast='+'):
 155         if not device in self.devices:
 156             raise DeviceNotFoundError(device)
 157         if ip in self.devices[device].addrs:
 158             raise AddressAlreadyExistsError(ip)
 159         self.devices[device].addrs[ip] = Address(ip, prefix, broadcast)
 160
 161     @handler(u'Deletes an address from a device')
 162     def delete(self, device, ip):
 163         if not device in self.devices:
 164             raise DeviceNotFoundError(device)
 165         if not ip in self.devices[device].addrs:
 166             raise AddressNotFoundError(ip)
 167         del self.devices[device].addrs[ip]
 168
 169     @handler(u'Flushes addresses from a device')
 170     def flush(self, device):
 171         if not device in self.devices:
 172             raise DeviceNotFoundError(device)
 173         self.devices[device].addrs = dict()
 174
 175     @handler(u'List all addresses from a device')
 176     def list(self, device):
 177         try:
 178             k = self.devices[device].addrs.keys()
 179         except ValueError:
 180             k = list()
 181         return k
 182
 183     @handler(u'Get information about addresses from a device')
 184     def show(self, device):
 185         try:
 186             k = self.devices[device].addrs.values()
 187         except ValueError:
 188             k = list()
 189         return k
 190
 191
 192 class Device(Sequence):
 193
 194     def __init__(self, name, mac):
 195         self.name = name
 196         self.mac = mac
 197         self.addrs = dict()
 198         self.routes = list()
 199
 200     def as_tuple(self):
 201         return (self.name, self.mac)
 202
 203 class DeviceHandler(Handler):
 204
 205     handler_help = u"Manage network devices"
 206
 207     def __init__(self, devices):
 208         # FIXME remove templates to execute commands
 209         from mako.template import Template
 210         self.devices = devices
 211         template_dir = path.join(path.dirname(__file__), 'templates')
 212         dev_fn = path.join(template_dir, 'device')
 213         self.device_template = Template(filename=dev_fn)
 214
 215     @handler(u'Bring the device up')
 216     def up(self, name):
 217         if name in self.devices:
 218             print self.device_template.render(dev=name, action='up')
 219         else:
 220             raise DeviceNotFoundError(name)
 221
 222     @handler(u'Bring the device down')
 223     def down(self, name):
 224         if name in self.devices:
 225             print self.device_template.render(dev=name, action='down')
 226         else:
 227             raise DeviceNotFoundError(name)
 228
 229     @handler(u'List all devices')
 230     def list(self):
 231         return self.devices.keys()
 232
 233     @handler(u'Get information about a device')
 234     def show(self):
 235         return self.devices.items()
 236
 237
 238 def get_devices():
 239     p = Popen(('ip', 'link', 'list'), stdout=PIPE, close_fds=True)
 240     string = p.stdout.read()
 241     p.wait()
 242     d = dict()
 243     i = string.find('eth')
 244     while i != -1:
 245         eth = string[i:i+4]
 246         m = string.find('link/ether', i+4)
 247         mac = string[ m+11 : m+11+17]
 248         d[eth] = Device(eth, mac)
 249         i = string.find('eth', m+11+17)
 250     return d
 251
 252 class IpHandler(Restorable, ConfigWriter, TransactionalHandler):
 253
 254     handler_help = u"Manage IP devices, addresses and routes"
 255
 256     _persistent_attrs = 'devices'
 257
 258     _restorable_defaults = dict(devices=get_devices())
 259
 260     _config_writer_files = ('device', 'ip_add', 'ip_del', 'ip_flush',
 261                             'route_add', 'route_del', 'route_flush')
 262     _config_writer_tpl_dir = path.join(path.dirname(__file__), 'templates')
 263
 264     def __init__(self, pickle_dir='.', config_dir='.'):
 265         r"Initialize DhcpHandler object, see class documentation for details."
 266         self._persistent_dir = pickle_dir
 267         self._config_writer_cfg_dir = config_dir
 268         self._config_build_templates()
 269         self._restore()
 270         self.addr = AddressHandler(self.devices)
 271         self.route = RouteHandler(self.devices)
 272         self.dev = DeviceHandler(self.devices)
 273
 274     def _write_config(self):
 275         r"_write_config() -> None :: Execute all commands."
 276         for device in self.devices.values():
 277             print self._render_config('route_flush', dict(dev=device.name))
 278             print self._render_config('ip_flush', dict(dev=device.name))
 279             for address in device.addrs.values():
 280                 print self._render_config('ip_add', dict(
 281                         dev = device.name,
 282                         addr = address.ip,
 283                         prefix = address.prefix,
 284                         broadcast = address.broadcast,
 285                     )
 286                 )
 287             for route in device.routes:
 288                 print self._render_config('route_add', dict(
 289                         dev = device.name,
 290                         net_addr = route.net_addr,
 291                         prefix = route.prefix,
 292                         gateway = route.gateway,
 293                     )
 294                 )
 295
 296
 297 if __name__ == '__main__':
 298
 299     ip = IpHandler()
 300     print '----------------------'
 301     ip.dev.up('eth0')
 302     ip.addr.add('eth0','192.168.0.23','24','192.168.255.255')
 303     ip.addr.add('eth0','192.168.0.26','24')
 304     ip.commit()
 305     ip.route.add('eth0','192.168.0.0','24','192.168.0.1')
 306     ip.route.add('eth0','192.168.0.5','24','192.168.0.1')
 307     ip.commit()
 308     ip.route.flush('eth0')
 309     ip.commit()
 310     ip.addr.delete('eth0','192.168.0.23')
 311     ip.commit()
 312
 313
 314
 315