1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
#!/usr/bin/env python3
#
# Copyright (C) 2018-2020 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# 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, see <http://www.gnu.org/licenses/>.
"""
conf-mode script for 'system host-name' and 'system domain-name'.
"""
import os
import re
import sys
import copy
import glob
import argparse
import jinja2
import vyos.util
import vyos.hostsd_client
from vyos.config import Config
from vyos import ConfigError
from vyos.util import cmd, call, run, process_named_running
from vyos import airbag
airbag.enable()
default_config_data = {
'hostname': 'vyos',
'domain_name': '',
'domain_search': [],
'nameserver': [],
'nameservers_dhcp_interfaces': [],
'static_host_mapping': {}
}
hostsd_tag = 'system'
def get_config():
conf = Config()
hosts = copy.deepcopy(default_config_data)
hosts['hostname'] = conf.return_value("system host-name")
# This may happen if the config is not loaded yet,
# e.g. if run by cloud-init
if not hosts['hostname']:
hosts['hostname'] = default_config_data['hostname']
if conf.exists("system domain-name"):
hosts['domain_name'] = conf.return_value("system domain-name")
hosts['domain_search'].append(hosts['domain_name'])
for search in conf.return_values("system domain-search domain"):
hosts['domain_search'].append(search)
hosts['nameserver'] = conf.return_values("system name-server")
hosts['nameservers_dhcp_interfaces'] = conf.return_values("system name-servers-dhcp")
# system static-host-mapping
for hn in conf.list_nodes('system static-host-mapping host-name'):
hosts['static_host_mapping'][hn] = {}
hosts['static_host_mapping'][hn]['address'] = conf.return_value(f'system static-host-mapping host-name {hn} inet')
hosts['static_host_mapping'][hn]['aliases'] = conf.return_values(f'system static-host-mapping host-name {hn} alias')
return hosts
def verify(hosts):
if hosts is None:
return None
# pattern $VAR(@) "^[[:alnum:]][-.[:alnum:]]*[[:alnum:]]$" ; "invalid host name $VAR(@)"
hostname_regex = re.compile("^[A-Za-z0-9][-.A-Za-z0-9]*[A-Za-z0-9]$")
if not hostname_regex.match(hosts['hostname']):
raise ConfigError('Invalid host name ' + hosts["hostname"])
# pattern $VAR(@) "^.{1,63}$" ; "invalid host-name length"
length = len(hosts['hostname'])
if length < 1 or length > 63:
raise ConfigError(
'Invalid host-name length, must be less than 63 characters')
all_static_host_mapping_addresses = []
# static mappings alias hostname
for host, hostprops in hosts['static_host_mapping'].items():
if not hostprops['address']:
raise ConfigError(f'IP address required for static-host-mapping "{host}"')
all_static_host_mapping_addresses.append(hostprops['address'])
for a in hostprops['aliases']:
if not hostname_regex.match(a) and len(a) != 0:
raise ConfigError(f'Invalid alias "{a}" in static-host-mapping "{host}"')
# TODO: add warnings for nameservers_dhcp_interfaces if interface doesn't
# exist or doesn't have address dhcp(v6)
return None
def generate(config):
pass
def apply(config):
if config is None:
return None
## Send the updated data to vyos-hostsd
try:
hc = vyos.hostsd_client.Client()
hc.set_host_name(config['hostname'], config['domain_name'])
hc.delete_search_domains([hostsd_tag])
if config['domain_search']:
hc.add_search_domains({hostsd_tag: config['domain_search']})
hc.delete_name_servers([hostsd_tag])
if config['nameserver']:
hc.add_name_servers({hostsd_tag: config['nameserver']})
# add our own tag's (system) nameservers and search to resolv.conf
hc.delete_name_server_tags_system(hc.get_name_server_tags_system())
hc.add_name_server_tags_system([hostsd_tag])
# this will add the dhcp client nameservers to resolv.conf
for intf in config['nameservers_dhcp_interfaces']:
hc.add_name_server_tags_system([f'dhcp-{intf}', f'dhcpv6-{intf}'])
hc.delete_hosts([hostsd_tag])
if config['static_host_mapping']:
hc.add_hosts({hostsd_tag: config['static_host_mapping']})
hc.apply()
except vyos.hostsd_client.VyOSHostsdError as e:
raise ConfigError(str(e))
## Actually update the hostname -- vyos-hostsd doesn't do that
# No domain name -- the Debian way.
hostname_new = config['hostname']
# rsyslog runs into a race condition at boot time with systemd
# restart rsyslog only if the hostname changed.
hostname_old = cmd('hostnamectl --static')
call(f'hostnamectl set-hostname --static {hostname_new}')
# Restart services that use the hostname
if hostname_new != hostname_old:
call("systemctl restart rsyslog.service")
# If SNMP is running, restart it too
if process_named_running('snmpd'):
call('systemctl restart snmpd.service')
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
sys.exit(1)
|
