summaryrefslogtreecommitdiff
path: root/src/conf_mode/dns_dynamic.py
blob: d71dc22fd54361f39fde0d7a6c750ef82217b933 (plain)
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
#!/usr/bin/env python3
#
# Copyright (C) 2018-2023 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/>.

import os

from sys import exit

from vyos.config import Config
from vyos.configverify import verify_interface_exists
from vyos.template import render
from vyos.utils.process import call
from vyos import ConfigError
from vyos import airbag
airbag.enable()

config_file = r'/run/ddclient/ddclient.conf'
systemd_override = r'/run/systemd/system/ddclient.service.d/override.conf'

# Protocols that require zone
zone_necessary = ['cloudflare', 'godaddy', 'hetzner', 'gandi', 'nfsn']

# Protocols that do not require username
username_unnecessary = ['1984', 'cloudflare', 'cloudns', 'duckdns', 'freemyip', 'hetzner', 'keysystems', 'njalla']

# Protocols that support TTL
ttl_supported = ['cloudflare', 'gandi', 'hetzner', 'dnsexit', 'godaddy', 'nfsn']

# Protocols that support both IPv4 and IPv6
dualstack_supported = ['cloudflare', 'dyndns2', 'freedns', 'njalla']

# dyndns2 protocol in ddclient honors dual stack for selective servers
# because of the way it is implemented in ddclient
dyndns_dualstack_servers = ['members.dyndns.org', 'dynv6.com']

def get_config(config=None):
    if config:
        conf = config
    else:
        conf = Config()

    base = ['service', 'dns', 'dynamic']
    if not conf.exists(base):
        return None

    dyndns = conf.get_config_dict(base, key_mangling=('-', '_'),
                                  no_tag_node_value_mangle=True,
                                  get_first_key=True,
                                  with_recursive_defaults=True)

    dyndns['config_file'] = config_file
    return dyndns

def verify(dyndns):
    # bail out early - looks like removal from running config
    if not dyndns or 'address' not in dyndns:
        return None

    for address in dyndns['address']:
        # If dyndns address is an interface, ensure it exists
        if address != 'web':
            verify_interface_exists(address)

        # RFC2136 - configuration validation
        if 'rfc2136' in dyndns['address'][address]:
            for config in dyndns['address'][address]['rfc2136'].values():
                for field in ['host_name', 'zone', 'server', 'key']:
                    if field not in config:
                        raise ConfigError(f'"{field.replace("_", "-")}" is required for RFC2136 '
                                          f'based Dynamic DNS service on "{address}"')

        # Dynamic DNS service provider - configuration validation
        if 'web_options' in dyndns['address'][address] and address != 'web':
            raise ConfigError(f'"web-options" is applicable only when using HTTP(S) web request to obtain the IP address')

        # Dynamic DNS service provider - configuration validation
        if 'service' in dyndns['address'][address]:
            for service, config in dyndns['address'][address]['service'].items():
                error_msg = f'is required for Dynamic DNS service "{service}" on "{address}"'

                for field in ['host_name', 'password', 'protocol']:
                    if field not in config:
                        raise ConfigError(f'"{field.replace("_", "-")}" {error_msg}')

                if config['protocol'] in zone_necessary and 'zone' not in config:
                    raise ConfigError(f'"zone" {error_msg}')

                if config['protocol'] not in zone_necessary and 'zone' in config:
                    raise ConfigError(f'"{config["protocol"]}" does not support "zone"')

                if config['protocol'] not in username_unnecessary and 'username' not in config:
                    raise ConfigError(f'"username" {error_msg}')

                if config['protocol'] not in ttl_supported and 'ttl' in config:
                    raise ConfigError(f'"{config["protocol"]}" does not support "ttl"')

                if config['ip_version'] == 'both':
                    if config['protocol'] not in dualstack_supported:
                        raise ConfigError(f'"{config["protocol"]}" does not support '
                                          f'both IPv4 and IPv6 at the same time')
                    # dyndns2 protocol in ddclient honors dual stack only for dyn.com (dyndns.org)
                    if config['protocol'] == 'dyndns2' and 'server' in config and config['server'] not in dyndns_dualstack_servers:
                        raise ConfigError(f'"{config["protocol"]}" does not support '
                                          f'both IPv4 and IPv6 at the same time for "{config["server"]}"')

                if {'wait_time', 'expiry_time'} <= config.keys() and int(config['expiry_time']) < int(config['wait_time']):
                        raise ConfigError(f'"expiry-time" must be greater than "wait-time"')

    return None

def generate(dyndns):
    # bail out early - looks like removal from running config
    if not dyndns or 'address' not in dyndns:
        return None

    render(config_file, 'dns-dynamic/ddclient.conf.j2', dyndns, permission=0o600)
    render(systemd_override, 'dns-dynamic/override.conf.j2', dyndns)
    return None

def apply(dyndns):
    systemd_service = 'ddclient.service'
    # Reload systemd manager configuration
    call('systemctl daemon-reload')

    # bail out early - looks like removal from running config
    if not dyndns or 'address' not in dyndns:
        call(f'systemctl stop {systemd_service}')
        if os.path.exists(config_file):
            os.unlink(config_file)
    else:
        call(f'systemctl reload-or-restart {systemd_service}')

    return None

if __name__ == '__main__':
    try:
        c = get_config()
        verify(c)
        generate(c)
        apply(c)
    except ConfigError as e:
        print(e)
        exit(1)