-from mako.template import Template
-from mako.runtime import Context
-from os import path
-try:
- import cPickle as pickle
-except ImportError:
- import pickle
-try:
- from dispatcher import handler
-except ImportError:
- def handler(f): return f # NOP for testing
-
-__ALL__ = ('DhcpHandler',)
-
-pickle_ext = '.pkl'
-pickle_vars = 'vars'
-pickle_hosts = 'hosts'
-
-config_filename = 'dhcpd.conf'
-
-template_dir = path.join(path.dirname(__file__), 'templates')
-
-class Error(RuntimeError):
- r"""
- Error(command) -> Error instance :: Base DhcpHandler exception class.
-
- All exceptions raised by the DhcpHandler inherits from this one, so you can
- easily catch any DhcpHandler exception.
-
- message - A descriptive error message.
- """
-
- def __init__(self, message):
- r"Initialize the Error object. See class documentation for more info."
- self.message = message
-
- def __str__(self):
- return self.message
-
-class HostError(Error, KeyError):
- r"""
- HostError(hostname) -> HostError instance
-
- This is the base exception for all host related errors.
- """
-
- def __init__(self, hostname):
- r"Initialize the object. See class documentation for more info."
- self.message = 'Host error: "%s"' % hostname
-
-class HostAlreadyExistsError(HostError):
- r"""
- HostAlreadyExistsError(hostname) -> HostAlreadyExistsError instance
-
- This exception is raised when trying to add a hostname that already exists.
- """
-
- def __init__(self, hostname):
- r"Initialize the object. See class documentation for more info."
- self.message = 'Host already exists: "%s"' % hostname
-
-class HostNotFoundError(HostError):
- r"""
- HostNotFoundError(hostname) -> HostNotFoundError instance
-
- This exception is raised when trying to operate on a hostname that doesn't
- exists.
- """
-
- def __init__(self, hostname):
- r"Initialize the object. See class documentation for more info."
- self.message = 'Host not found: "%s"' % hostname
-
-class ParameterError(Error, KeyError):
- r"""
- ParameterError(paramname) -> ParameterError instance
-
- This is the base exception for all DhcpHandler parameters related errors.
- """
-
- def __init__(self, paramname):
- r"Initialize the object. See class documentation for more info."
- self.message = 'Parameter error: "%s"' % paramname
-
-class ParameterNotFoundError(ParameterError):
- r"""
- ParameterNotFoundError(hostname) -> ParameterNotFoundError instance
-
- This exception is raised when trying to operate on a parameter that doesn't
- exists.
- """
-
- def __init__(self, paramname):
- r"Initialize the object. See class documentation for more info."
- self.message = 'Parameter not found: "%s"' % paramname
-
-
-class Host:
- r"""Host(name, ip, mac) -> Host instance :: Class representing a host.
-
- name - Host name, should be a fully qualified name, but no checks are done.
- ip - IP assigned to the hostname.
- mac - MAC address to associate to the hostname.
- """
-
- def __init__(self, name, ip, mac):
- r"Initialize Host object, see class documentation for details."
- self.name = name
- self.ip = ip
- self.mac = mac
-
- def __iter__(self):
- r"Iterate over a host."
- yield self.name
- yield self.ip
- yield self.mac
-
-class HostHandler:
- r"""HostHandler(hosts) -> HostHandler instance :: Handle a list of hosts.
-
- This class is a helper for DhcpHandler to do all the work related to hosts
- administration.
-
- hosts - A dictionary with string keys (hostnames) and Host instances values.
- """
-
- def __init__(self, hosts):
- r"Initialize HostHandler object, see class documentation for details."
- self.hosts = hosts
-
- @handler
- def add(self, name, ip, mac):
- r"add(name, ip, mac) -> None :: Add a host to the hosts list."
- if name in self.hosts:
- raise HostAlreadyExistsError(name)
- self.hosts[name] = Host(name, ip, mac)
-
- @handler
- def update(self, name, ip=None, mac=None):
- r"update(name[, ip[, mac]]) -> None :: Update a host of the hosts list."
- if not name in self.hosts:
- raise HostNotFoundError(name)
- if ip is not None:
- self.hosts[name].ip = ip
- if mac is not None:
- self.hosts[name].mac = mac
-
- @handler
- def delete(self, name):
- r"delete(name) -> None :: Delete a host of the hosts list."
- if not name in self.hosts:
- raise HostNotFoundError(name)
- del self.hosts[name]
-
- @handler
- def get(self, name):
- r"""get(name) -> CSV string :: List all the information of a host.
-
- The host is returned as a CSV list of: hostname,ip,mac
- """
- if not name in self.hosts:
- raise HostNotFoundError(name)
- h = self.hosts[name]
- return ','.join(list(h))
-
- @handler
- def list(self):
- r"""list() -> CSV string :: List all the hostnames.
-
- The list is returned as a single CSV line with all the hostnames.
- """
- return ','.join(self.hosts)
-
- @handler
- def show(self):
- r"""show() -> CSV string :: List all the complete hosts information.
-
- The hosts are returned as a CSV list with each host in a line, like:
- hostname,ip,mac
- """
- hosts = self.hosts.values()
- return '\n'.join(','.join(h) for h in hosts)
-
-class DhcpHandler:
- r"""DhcpHandler([pickle_dir[, config_dir]]) -> DhcpHandler instance.
-
- Handles DHCP service commands for the dhcpd program.
-
- pickle_dir - Directory where to write the persistent configuration data.
-
- config_dir - Directory where to store de generated configuration files.
-
- Both defaults to the current working directory.
- """
-
- def __init__(self, pickle_dir='.', config_dir='.'):
- r"Initialize DhcpHandler object, see class documentation for details."
- self.pickle_dir = pickle_dir
- self.config_dir = config_dir
- filename = path.join(template_dir, config_filename)
- self.template = Template(filename=filename)
- try:
- self._load()
- except IOError:
- # This is the first time the handler is used, create a basic
- # setup using some nice defaults
- self.hosts = dict()
- self.vars = dict(
- domain_name = 'example.com',
- dns_1 = 'ns1.example.com',
- dns_2 = 'ns2.example.com',
- net_address = '192.168.0.0',
- net_mask = '255.255.255.0',
- net_start = '192.168.0.100',
- net_end = '192.168.0.200',
- net_gateway = '192.168.0.1',
- )
- self._dump()
- self._write_config()
- self.host = HostHandler(self.hosts)
-
- @handler
- def set(self, param, value):
- r"set(param, value) -> None :: Set a DHCP parameter."
- if not param in self.vars:
- raise ParameterNotFoundError(param)
- self.vars[param] = value
-
- @handler
- def get(self, param):
- r"get(param) -> None :: Get a DHCP parameter."
- if not param in self.vars:
- raise ParameterNotFoundError(param)
- return self.vars[param]
-
- @handler
- def list(self):
- r"""list() -> CSV string :: List all the parameter names.
-
- The list is returned as a single CSV line with all the names.
- """
- return ','.join(self.vars)
-
- @handler
- def show(self):
- r"""show() -> CSV string :: List all the parameters (with their values).
-
- The parameters are returned as a CSV list with each parameter in a
- line, like:
- name,value
- """
- return '\n'.join(('%s,%s' % (k, v) for (k, v) in self.vars.items()))
-
- @handler
- def start(self):
- r"start() -> None :: Start the DHCP service."
- #esto seria para poner en una interfaz
- #y seria el hook para arrancar el servicio
- pass
-
- @handler
- def stop(self):
- r"stop() -> None :: Stop the DHCP service."
- #esto seria para poner en una interfaz
- #y seria el hook para arrancar el servicio
- pass
-
- @handler
- def restart(self):
- r"restart() -> None :: Restart the DHCP service."
- #esto seria para poner en una interfaz
- #y seria el hook para arrancar el servicio
- pass
-
- @handler
- def reload(self):
- r"reload() -> None :: Reload the configuration of the DHCP service."
- #esto seria para poner en una interfaz
- #y seria el hook para arrancar el servicio
- pass
-
- @handler
- def commit(self):
- r"commit() -> None :: Commit the changes and reload the DHCP service."
- #esto seria para poner en una interfaz
- #y seria que hace el pickle deberia llamarse
- #al hacerse un commit
- self._dump()
- self._write_config()
- self.reload()
-
- @handler
- def rollback(self):
- r"rollback() -> None :: Discard the changes not yet commited."
- self._load()
-
- def _dump(self):
- r"_dump() -> None :: Dump all persistent data to pickle files."
- # XXX podría ir en una clase base
- self._dump_var(self.vars, pickle_vars)
- self._dump_var(self.hosts, pickle_hosts)
-
- def _load(self):
- r"_load() -> None :: Load all persistent data from pickle files."
- # XXX podría ir en una clase base
- self.vars = self._load_var(pickle_vars)
- self.hosts = self._load_var(pickle_hosts)
-
- def _pickle_filename(self, name):
- r"_pickle_filename() -> string :: Construct a pickle filename."
- # XXX podría ir en una clase base
- return path.join(self.pickle_dir, name) + pickle_ext
-
- def _dump_var(self, var, name):
- r"_dump_var() -> None :: Dump a especific variable to a pickle file."
- # XXX podría ir en una clase base
- pkl_file = file(self._pickle_filename(name), 'wb')
- pickle.dump(var, pkl_file, 2)
- pkl_file.close()
-
- def _load_var(self, name):
- r"_load_var() -> object :: Load a especific pickle file."
- # XXX podría ir en una clase base
- return pickle.load(file(self._pickle_filename(name)))
-
- def _write_config(self):
- r"_write_config() -> None :: Generate all the configuration files."
- # XXX podría ir en una clase base, ver como generalizar variables a
- # reemplazar en la template
- out_file = file(path.join(self.config_dir, config_filename), 'w')
- ctx = Context(out_file, hosts=self.hosts.values(), **self.vars)
- self.template.render_context(ctx)
- out_file.close()
-
-if __name__ == '__main__':
-
- import os
-
- dhcp_handler = DhcpHandler()
-
- def dump():
- print '-' * 80
- print 'Variables:', dhcp_handler.list()
- print dhcp_handler.show()
- print
- print 'Hosts:', dhcp_handler.host.list()
- print dhcp_handler.host.show()
- print '-' * 80
-
- dump()
-
- dhcp_handler.host.add('my_name','192.168.0.102','00:12:ff:56')
-
- dhcp_handler.host.update('my_name','192.168.0.192','00:12:ff:56')
-
- dhcp_handler.host.add('nico','192.168.0.188','00:00:00:00')
-
- dhcp_handler.set('domain_name','baryon.com.ar')
-
- try:
- dhcp_handler.set('sarasa','baryon.com.ar')
- except KeyError, e:
- print 'Error:', e
-
- dhcp_handler.commit()
-
- dump()
-
- for f in (pickle_vars + pickle_ext, pickle_hosts + pickle_ext,
- config_filename):
- os.unlink(f)
projects / software / pymin.git / blobdiff