URL: https://github.com/freeipa/freeipa/pull/551 Author: HonzaCholasta Title: #551: config: re-add `init_config` and `config` Action: opened
PR body: """ Re-add `init_config` and `config` to `ipapython.config`, because they are used by Ipsilon (see https://pagure.io/ipsilon/issue/265). This partially reverts commit 7b966e8577fdb56f069cf26a6ab4d6c77b8743b9. https://pagure.io/freeipa/issue/6707 This supersedes PR #515. """ To pull the PR as Git branch: git remote add ghfreeipa https://github.com/freeipa/freeipa git fetch ghfreeipa pull/551/head:pr551 git checkout pr551
From c5b251c0480142be159acfd9ff9b2e3301b82505 Mon Sep 17 00:00:00 2001 From: Jan Cholasta <jchol...@redhat.com> Date: Wed, 8 Mar 2017 10:39:51 +0000 Subject: [PATCH] config: re-add `init_config` and `config` Re-add `init_config` and `config` to `ipapython.config`, because they are used by Ipsilon (see https://pagure.io/ipsilon/issue/265). This partially reverts commit 7b966e8577fdb56f069cf26a6ab4d6c77b8743b9. https://pagure.io/freeipa/issue/6707 --- ipapython/config.py | 149 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 149 insertions(+) diff --git a/ipapython/config.py b/ipapython/config.py index 5f1295c..b983a72 100644 --- a/ipapython/config.py +++ b/ipapython/config.py @@ -22,9 +22,35 @@ Option, Values, OptionParser, IndentedHelpFormatter, OptionValueError) # pylint: enable=deprecated-module from copy import copy +import socket + +from dns import resolver, rdatatype +from dns.exception import DNSException +import dns.name +# pylint: disable=import-error +from six.moves.configparser import SafeConfigParser +from six.moves.urllib.parse import urlsplit +# pylint: enable=import-error from ipapython.dn import DN +try: + from ipaplatform.paths import paths +except ImportError: + IPA_DEFAULT_CONF = '/etc/ipa/default.conf' +else: + IPA_DEFAULT_CONF = paths.IPA_DEFAULT_CONF + + +class IPAConfigError(Exception): + def __init__(self, msg=''): + self.msg = msg + Exception.__init__(self, msg) + + def __repr__(self): + return self.msg + + __str__ = __repr__ class IPAFormatter(IndentedHelpFormatter): """Our own optparse formatter that indents multiple lined usage string.""" @@ -111,8 +137,131 @@ def verify_args(parser, args, needed_args = None): parser.error("no %s specified" % needed_list[len_have]) +class IPAConfig(object): + def __init__(self): + self.default_realm = None + self.default_server = [] + self.default_domain = None + + def get_realm(self): + if self.default_realm: + return self.default_realm + else: + raise IPAConfigError("no default realm") + + def get_server(self): + if len(self.default_server): + return self.default_server + else: + raise IPAConfigError("no default server") + + def get_domain(self): + if self.default_domain: + return self.default_domain + else: + raise IPAConfigError("no default domain") + +# Global library config +config = IPAConfig() + +def __parse_config(discover_server = True): + p = SafeConfigParser() + p.read(IPA_DEFAULT_CONF) + + try: + if not config.default_realm: + config.default_realm = p.get("global", "realm") + except Exception: + pass + if discover_server: + try: + s = p.get("global", "xmlrpc_uri") + server = urlsplit(s) + config.default_server.append(server.netloc) + except Exception: + pass + try: + if not config.default_domain: + config.default_domain = p.get("global", "domain") + except Exception: + pass + +def __discover_config(discover_server = True): + servers = [] + try: + if not config.default_domain: + # try once with REALM -> domain + domain = str(config.default_realm).lower() + name = "_ldap._tcp." + domain + + try: + servers = resolver.query(name, rdatatype.SRV) + except DNSException: + # try cycling on domain components of FQDN + try: + domain = dns.name.from_text(socket.getfqdn()) + except DNSException: + return False + + while True: + domain = domain.parent() + + if str(domain) == '.': + return False + name = "_ldap._tcp.%s" % domain + try: + servers = resolver.query(name, rdatatype.SRV) + break + except DNSException: + pass + + config.default_domain = str(domain).rstrip(".") + + if discover_server: + if not servers: + name = "_ldap._tcp.%s." % config.default_domain + try: + servers = resolver.query(name, rdatatype.SRV) + except DNSException: + pass + + for server in servers: + hostname = str(server.target).rstrip(".") + config.default_server.append(hostname) + + except Exception: + pass + def add_standard_options(parser): parser.add_option("--realm", dest="realm", help="Override default IPA realm") parser.add_option("--server", dest="server", help="Override default FQDN of IPA server") parser.add_option("--domain", dest="domain", help="Override default IPA DNS domain") + +def init_config(options=None): + if options: + config.default_realm = options.realm + config.default_domain = options.domain + if options.server: + config.default_server.extend(options.server.split(",")) + + if len(config.default_server): + discover_server = False + else: + discover_server = True + __parse_config(discover_server) + __discover_config(discover_server) + + # make sure the server list only contains unique items + new_server = [] + for server in config.default_server: + if server not in new_server: + new_server.append(server) + config.default_server = new_server + + if not config.default_realm: + raise IPAConfigError("IPA realm not found in DNS, in the config file (/etc/ipa/default.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/default.conf) or on the command line.") + if not config.default_domain: + raise IPAConfigError("IPA domain not found in the config file (/etc/ipa/default.conf) or on the command line.")
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