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# Authors: Karl MacMillan <kmacmill@redhat.com>
#
# Copyright (C) 2007 Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; version 2 only
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
import ConfigParser
from optparse import OptionParser
import krbV
import socket
import ipa.dnsclient
import re
class IPAConfigError(Exception):
def __init__(self, msg=''):
self.msg = msg
Exception.__init__(self, msg)
def __repr__(self):
return self.msg
__str__ = __repr__
class IPAConfig:
def __init__(self):
self.default_realm = None
self.default_server = []
def get_realm(self):
if self.default_realm:
return self.default_realm
else:
raise IPAConfigError("no default realm")
def get_server(self):
if self.default_server:
return self.default_server
else:
raise IPAConfigError("no default server")
# Global library config
config = IPAConfig()
def __parse_config():
p = ConfigParser.SafeConfigParser()
p.read("/etc/ipa/ipa.conf")
try:
if not config.default_realm:
config.default_realm = p.get("defaults", "realm")
if not config.default_server:
s = p.get("defaults", "server")
config.default_server = re.sub("\s+", "", s).split(',')
except:
pass
def __discover_config():
try:
if not config.default_realm:
krbctx = krbV.default_context()
config.default_realm = krbctx.default_realm
if not config.default_realm:
return False
#try once with REALM -> domain
name = "_ldap._tcp."+config.default_realm+"."
rs = ipa.dnsclient.query(name, ipa.dnsclient.DNS_C_IN, ipa.dnsclient.DNS_T_SRV)
rl = len(rs)
#try cycling on domain components of FQDN
if rl == 0:
name = socket.getfqdn()
while rl == 0:
tok = name.find(".")
if tok == -1:
return False
name = name[tok+1:]
q = "_ldap._tcp." + name + "."
rs = ipa.dnsclient.query(q, ipa.dnsclient.DNS_C_IN, ipa.dnsclient.DNS_T_SRV)
rl = len(rs)
for r in rs:
if r.dns_type == ipa.dnsclient.DNS_T_SRV:
rsrv = r.rdata.server.rstrip(".")
config.default_server.append(rsrv)
except:
pass
def usage():
return """ --realm\tset the IPA realm
--server\tset the IPA server
"""
def __parse_args(args):
# Can't use option parser because it doesn't easily leave
# unknown arguments - creating our own seems simpler.
#
# should make this more robust and handle --realm=foo syntax
out_args = []
i = 0
while i < len(args):
if args[i] == "--realm":
if i == len(args) - 1:
raise IPAConfigError("missing argument to --realm")
config.default_realm = args[i + 1]
i = i + 2
continue
if args[i] == "--server":
if i == len(args) - 1:
raise IPAConfigError("missing argument to --server")
config.default_server.append(args[i + 1])
i = i + 2
continue
out_args.append(args[i])
i = i + 1
return out_args
def init_config(args=None):
out_args = None
if args:
out_args = __parse_args(args)
__parse_config()
__discover_config()
if not config.default_realm:
raise IPAConfigError("IPA realm not found in DNS, in the config file (/etc/ipa/ipa.conf) or on the command line.")
if not config.default_server:
raise IPAConfigError("IPA server not found in DNS, in the config file (/etc/ipa/ipa.conf) or on the command line.")
if out_args:
return out_args
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