def main():
# initialize mappings for the replacement fields in the templates
mappings = parms('ddns_config.yaml')
mappings.add('key_name', 'cloud.ddns')
mappings.add('secret_key', get_ddns_key())
# initialize content
named = content('templates/template.named.conf.local')
options = content('templates/template.named.conf.options')
forward_zone = content('templates/template.forward.cloudzone')
reverse_zone = {}
for net in mappings.value('ip_ranges'):
reverse_zone[net] = content('templates/template.reverse.cloudzone')
resolvconf = content('templates/template.resolv.conf')
# create content for {forward_ips} mapping in named.conf
text = ""
for ip in mappings.value('forwarders'):
text += "%s; " % ip
mappings.add('forward_ips', text)
# create content for {reverse_zones} mapping in named.conf
rz_fields = ""
zone_template = content('templates/template.named.zone')
rz_dict = {}
rz_dict['key_name'] = mappings.value('key_name')
for net in mappings.value('ip_ranges'):
text = zone_template.text
rz_dict['revzone'] = reverse_dns_zone(net)
rz_dict['revzone_file'] = revzone_filename(net)
rz_fields += "%s\n" % text.format(**rz_dict)
mappings.add('reverse_zones', rz_fields)
# swap replacement fields with mapped content and add reverse lookup for the DNS instance IPs
named.replace_fields(mappings)
options.replace_fields(mappings)
forward_zone.replace_fields(mappings)
for net in mappings.value('ip_ranges'):
reverse_zone[net].replace_fields(mappings)
# add reverse lookup for the DNS instance
for ip in [
mappings.value('dns_fixed_ip'),
mappings.value('dns_floating_ip')
]:
if netaddr.IPAddress(ip) in netaddr.IPNetwork(net):
text = "%s IN A %s" % (mappings.value('dns_shortname'), ip)
reverse_zone[net].append(text)
resolvconf.replace_fields(mappings)
# write content
named.write('gen4bind/named.conf.local')
options.write('gen4bind/named.conf.options')
forward_zone.write('gen4bind/forward.cloudzone')
for net in mappings.value('ip_ranges'):
filename = "gen4bind/%s" % revzone_filename(net)
reverse_zone[net].write(filename)
resolvconf.write('gen4bind/resolv.conf')
#!/usr/bin/env python
import os # miscellaneous operating system interfaces
import sys # system paramteters
from ddns_common import parms
from ddns_common import file_suffix
from ddns_common import get_ddns_key
# initialize template/dictionary variables
mappings = parms('ddns_config.yaml')
key_name = 'cloud.ddns'
key_value = get_ddns_key()
text = "#!/bin/sh\n"
text += "source ./openrc.sh\n"
text += "python ddns.py\n"
text += "nsupdate -y %s:%s -v %s\n" % (key_name, key_value, 'A_records')
for net in mappings.value('ip_ranges'):
filename = "PTR_%s" % file_suffix(net)
text += "nsupdate -y %s:%s -v %s\n" % (key_name, key_value, filename)
text += "rm A_records PTR_*"
f = open('ddns.sh', 'w')
f.write(text)
f.close()
def main():
# Authenticate Credentials
try:
creds = get_nova_creds()
except:
print 'Please set OpenStack credentials, e.g. type source openrc.sh, and try again'
sys.exit()
# Retrieve the Nova client
nova = novaclient.Client(**creds)
# get template/dictionary variables
mappings = parms('ddns_config.yaml')
domain_name = mappings.value('domain_name')
dns_name = mappings.value('dns_shortname') + "." + domain_name
# initialize content for forward and reverse nsupdate files
content_A_rec = content("server " + dns_name + "\n")
content_PTR = {}
for net in mappings.value('ip_ranges'):
revzone = reverse_dns_zone(net)
text = "server %s\n" % dns_name
text += "zone %s\n" % revzone
content_PTR[net] = content(text)
# load the previous server list from a file
if os.path.isfile('ddns_instance_state.pckl'):
f = open('ddns_instance_state.pckl')
prev_servers = pickle.load(f)
f.close()
else:
prev_servers = []
# create a current list of servers and IPs that are valid for DNS updates
curr_servers = {}
for server in nova.servers.list(search_opts={'all_tenants': 1}):
if server.status != 'ACTIVE':
print "INFO: Server name %s has state %s" % (server.name, server.status)
elif not valid_hostname(server.name):
print "WARNING: Server name %s is not a valid hostname" % server.name
elif (server.name in prev_servers) and (server.networks.values() != prev_servers[server.name]):
print "WARNING: Server %s/%s is a duplicate of Server %s/%s" % (server.name, server.networks.values()[0], server.name, prev_servers[server.name][0])
elif server.name in curr_servers.keys(): # keys refers to the server names
print "WARNING: Server %s/%s is a duplicate of Server %s/%s" % (server.name, server.networks.values(), server.name, curr_servers[server.name][0])
else:
curr_servers[server.name] = server.networks.values()
# delete servers in the previous list but not in the current list
for server_name in prev_servers:
if not server_name in curr_servers:
# get saved ip_address
ip_addresses = prev_servers[server_name]
# create long hostname
server_name += '.' + domain_name
# update forward zone content
content_A_rec.append(
"update delete " + server_name + " A\n")
# update reverse zone content
for ip in ip_addresses[0]:
rev_net, rev_dns = get_reverse_net_dns(ip, mappings.value('ip_ranges'))
content_PTR[rev_net].append(
"update delete " + rev_dns + " 600 IN PTR " + server_name + ".\n")
# Add new servers, e.g. those in the current list but not the previous one
for server_name in curr_servers:
if not server_name in prev_servers:
# get the ip addresses, assume there is only one network, e.g. "nebula"
ip_addresses = curr_servers[server_name]
# create long hostname
server_name += "." + domain_name
# update forward zone content with address of the last ip address
forward_ip = ip_addresses[0][-1]
content_A_rec.append(
"update add " + server_name + " 600 A " + forward_ip + "\n")
# update reverse zone content
for ip in ip_addresses[0]:
rev_net, rev_dns = get_reverse_net_dns(ip, mappings.value('ip_ranges'))
content_PTR[rev_net].append(
"update add " + rev_dns + " 600 IN PTR " + server_name + ".\n")
# write content
content_A_rec.write('A_records')
for net in mappings.value('ip_ranges'):
filename = "PTR_%s" % file_suffix(net)
content_PTR[net].write(filename)
# dump current server list to a file
f = open('ddns_instance_state.pckl', 'w')
pickle.dump(curr_servers, f)
f.close()
def main():
# Authenticate Credentials
try:
creds = get_nova_creds()
except:
print 'Please set OpenStack credentials, e.g. type source openrc.sh, and try again'
sys.exit()
# Retrieve the Nova client
nova = novaclient.Client(**creds)
# get template/dictionary variables
mappings = parms('ddns_config.yaml')
domain_name = mappings.value('domain_name')
dns_name = mappings.value('dns_shortname') + "." + domain_name
# initialize content for forward and reverse nsupdate files
content_A_rec = content("server " + dns_name + "\n")
content_PTR = {}
for net in mappings.value('ip_ranges'):
revzone = reverse_dns_zone(net)
text = "server %s\n" % dns_name
text += "zone %s\n" % revzone
content_PTR[net] = content(text)
# load the previous server list from a file
if os.path.isfile('ddns_instance_state.pckl'):
f = open('ddns_instance_state.pckl')
prev_servers = pickle.load(f)
f.close()
else:
prev_servers = []
# create a current list of servers and IPs that are valid for DNS updates
curr_servers = {}
for server in nova.servers.list(search_opts={'all_tenants': 1}):
if server.status != 'ACTIVE':
print "INFO: Server name %s has state %s" % (server.name,
server.status)
elif not valid_hostname(server.name):
print "WARNING: Server name %s is not a valid hostname" % server.name
elif (server.name in prev_servers) and (server.networks.values() !=
prev_servers[server.name]):
print "WARNING: Server %s/%s is a duplicate of Server %s/%s" % (
server.name, server.networks.values()[0], server.name,
prev_servers[server.name][0])
elif server.name in curr_servers.keys(
): # keys refers to the server names
print "WARNING: Server %s/%s is a duplicate of Server %s/%s" % (
server.name, server.networks.values(), server.name,
curr_servers[server.name][0])
else:
curr_servers[server.name] = server.networks.values()
# delete servers in the previous list but not in the current list
for server_name in prev_servers:
if not server_name in curr_servers:
# get saved ip_address
ip_addresses = prev_servers[server_name]
# create long hostname
server_name += '.' + domain_name
# update forward zone content
content_A_rec.append("update delete " + server_name + " A\n")
# update reverse zone content
for ip in ip_addresses[0]:
rev_net, rev_dns = get_reverse_net_dns(
ip, mappings.value('ip_ranges'))
content_PTR[rev_net].append("update delete " + rev_dns +
" 600 IN PTR " + server_name +
".\n")
# Add new servers, e.g. those in the current list but not the previous one
for server_name in curr_servers:
if not server_name in prev_servers:
# get the ip addresses, assume there is only one network, e.g. "nebula"
ip_addresses = curr_servers[server_name]
# create long hostname
server_name += "." + domain_name
# update forward zone content with address of the last ip address
forward_ip = ip_addresses[0][-1]
content_A_rec.append("update add " + server_name + " 600 A " +
forward_ip + "\n")
# update reverse zone content
for ip in ip_addresses[0]:
rev_net, rev_dns = get_reverse_net_dns(
ip, mappings.value('ip_ranges'))
content_PTR[rev_net].append("update add " + rev_dns +
" 600 IN PTR " + server_name +
".\n")
# write content
content_A_rec.write('A_records')
for net in mappings.value('ip_ranges'):
filename = "PTR_%s" % file_suffix(net)
content_PTR[net].write(filename)
# dump current server list to a file
f = open('ddns_instance_state.pckl', 'w')
pickle.dump(curr_servers, f)
f.close()
#!/usr/bin/env python
import os # miscellaneous operating system interfaces
import sys # system paramteters
from ddns_common import parms
from ddns_common import file_suffix
from ddns_common import get_ddns_key
# initialize template/dictionary variables
mappings = parms('ddns_config.yaml')
key_name = 'cloud.ddns'
key_value = get_ddns_key()
text = "#!/bin/sh\n"
text += "source ./openrc.sh\n"
text += "python ddns.py\n"
text += "nsupdate -y %s:%s -v %s\n" % (key_name, key_value, 'A_records')
for net in mappings.value('ip_ranges'):
filename = "PTR_%s" % file_suffix(net)
text += "nsupdate -y %s:%s -v %s\n" % (key_name, key_value, filename)
text += "rm A_records PTR_*"
f = open('ddns.sh', 'w')
f.write(text)
f.close()