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authorSimo Sorce <ssorce@redhat.com>2011-02-17 08:30:36 -0500
committerSimo Sorce <ssorce@redhat.com>2011-02-17 19:43:52 -0500
commiteab4e36ee50a4d924d7889a167f4917fa9bf6136 (patch)
tree44e71c9124958183640701e0915dcbfaafef4542 /ipa-client/ipa-install/ipa-client-install
parent817dac3f043d2700a565dcd64666da69eb458cc4 (diff)
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Try to register DNS name through a DNS Update on install.
Fixes: https://fedorahosted.org/freeipa/ticket/935
Diffstat (limited to 'ipa-client/ipa-install/ipa-client-install')
-rwxr-xr-xipa-client/ipa-install/ipa-client-install111
1 files changed, 111 insertions, 0 deletions
diff --git a/ipa-client/ipa-install/ipa-client-install b/ipa-client/ipa-install/ipa-client-install
index dc49622..4b9bd29 100755
--- a/ipa-client/ipa-install/ipa-client-install
+++ b/ipa-client/ipa-install/ipa-client-install
@@ -32,6 +32,8 @@ try:
import ipaclient.ipachangeconf
import ipaclient.ntpconf
from ipapython.ipautil import run, user_input, CalledProcessError, file_exists
+ from ipapython import ipautil
+ from ipapython import dnsclient
from ipapython import sysrestore
from ipapython import version
from ipapython import certmonger
@@ -83,6 +85,8 @@ def parse_options():
default=False, help="uninstall an existing installation")
parser.add_option("", "--hostname", dest="hostname",
help="The hostname of this server (FQDN). By default of nodename from uname(2) is used.")
+ parser.add_option("", "--enable-dns-updates", dest="dns_updates", action="store_true", default=False,
+ help="Configures the machine to attempt dns updates when the ip address changes.")
options, args = parser.parse_args()
safe_opts = parser.get_safe_opts(options)
@@ -496,6 +500,9 @@ def configure_sssd_conf(fstore, cli_domain, cli_server, options):
domain.set_option('cache_credentials', True)
+ if options.dns_updates:
+ domain.set_option('ipa_dyndns_update', True)
+
domain.set_active(True)
sssdconfig.save_domain(domain)
@@ -503,6 +510,101 @@ def configure_sssd_conf(fstore, cli_domain, cli_server, options):
return 0
+def resolve_ipaddress(server):
+ """ Connect to the server's ldap port in order to determine what ip
+ address this machine uses as "public" ip (relative to the server).
+ """
+
+ s = socket.socket(socket.AF_INET, socket.SOCK_STREAM, socket.IPPROTO_TCP)
+ s.connect((server, 389))
+ addr, port = s.getsockname()
+ s.close()
+
+ return addr
+
+UPDATE_TEMPLATE_A = """
+zone $ZONE.
+update delete $HOSTNAME. IN A
+send
+update add $HOSTNAME. $TTL IN A $IPADDRESS
+send
+"""
+
+UPDATE_TEMPLATE_AAAA = """
+zone $ZONE.
+update delete $HOSTNAME. IN AAAA
+send
+update add $HOSTNAME. $TTL IN AAAA $IPADDRESS
+send
+"""
+
+UPDATE_FILE = "/etc/ipa/.dns_update.txt"
+CCACHE_FILE = "/etc/ipa/.dns_ccache"
+
+def update_dns(server, hostname):
+
+ ip = resolve_ipaddress(server)
+
+ sub_dict = dict(HOSTNAME=hostname,
+ IPADDRESS=ip,
+ TTL=1200,
+ ZONE='.'.join(hostname.split('.')[1:])
+ )
+
+ template = None
+ if len(ip.split('.')) == 4:
+ template = UPDATE_TEMPLATE_A
+ elif len(ip.split(':')) > 1:
+ template = UPDATE_TEMPLATE_AAAA
+
+ if template is None:
+ print >>sys.stderr, "Failed to determine machine's ip address."
+ print >>sys.stderr, "Failed to update DNS A record."
+ return
+
+ update_txt = ipautil.template_str(template, sub_dict)
+ update_fd = file(UPDATE_FILE, "w")
+ update_fd.write(update_txt)
+ update_fd.flush()
+ update_fd.close()
+
+ try:
+ ipautil.run(['/usr/bin/kinit', '-k', '-t', '/etc/krb5.keytab'],
+ env={'KRB5CCNAME':CCACHE_FILE})
+ except CalledProcessError, e:
+ print >>sys.stderr, "Failed to obtain host TGT."
+
+ try:
+ ipautil.run(['/usr/bin/nsupdate', '-g', "/etc/ipa/.dns_update.txt"],
+ env={'KRB5CCNAME':CCACHE_FILE})
+ print "DNS server record set to: %s -> %s" % (hostname, ip)
+ except CalledProcessError, e:
+ print >>sys.stderr, "Failed to update DNS A record. (%s)" % str(e)
+
+ try:
+ os.remove(UPDATE_FILE)
+ os.remove(CCACHE_FILE)
+ except:
+ pass
+
+def client_dns(server, hostname, dns_updates=False):
+
+ dns_ok = False
+
+ # Check if the client has an A record registered in its name.
+ rs = dnsclient.query(hostname+".", dnsclient.DNS_C_IN, dnsclient.DNS_T_A)
+ if len([ rec for rec in rs if rec.dns_type is not dnsclient.DNS_T_SOA ]) > 0:
+ dns_ok = True
+ else:
+ rs = dnsclient.query(hostname+".", dnsclient.DNS_C_IN, dnsclient.DNS_T_AAAA)
+ if len([ rec for rec in rs if rec.dns_type is not dnsclient.DNS_T_SOA ]) > 0:
+ dns_ok = True
+ else:
+ print "Warning: Hostname (%s) not found in DNS" % hostname
+
+ if dns_updates or not dns_ok:
+ update_dns(server, hostname)
+
def main():
safe_options, options = parse_options()
logging_setup(options)
@@ -740,6 +842,15 @@ def main():
configure_certmonger(fstore, subject_base, cli_realm, options)
+ #Try to update the DNS records, failure is not fatal
+ if not options.on_master:
+ if options.hostname:
+ hostname = options.hostname
+ else:
+ hostname = socket.gethostname()
+
+ client_dns(cli_server, hostname, options.dns_updates)
+
if options.sssd:
nscd_action = "stop"
nscd_status = "off"