summaryrefslogtreecommitdiff
path: root/src/conf_mode/lldp.py
blob: ec59c68d0d17982a3c025f4414c3f39ee116f322 (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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
#!/usr/bin/env python3
#
# Copyright (C) 2017-2020 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/>.

import os
import re

from copy import deepcopy
from jinja2 import FileSystemLoader, Environment
from sys import exit

from vyos.config import Config
from vyos.validate import is_addr_assigned,is_loopback_addr
from vyos.defaults import directories as vyos_data_dir
from vyos.version import get_version_data
from vyos import ConfigError
from vyos.util import call


config_file = "/etc/default/lldpd"
vyos_config_file = "/etc/lldpd.d/01-vyos.conf"
base = ['service', 'lldp']

default_config_data = {
    "options": '',
    "interface_list": '',
    "location": ''
}

def get_options(config):
    options = {}
    config.set_level(base)

    options['listen_vlan'] = config.exists('listen-vlan')
    options['mgmt_addr'] = []
    for addr in config.return_values('management-address'):
        if is_addr_assigned(addr) and not is_loopback_addr(addr):
            options['mgmt_addr'].append(addr)
        else:
            message = 'WARNING: LLDP management address {0} invalid - '.format(addr)
            if is_loopback_addr(addr):
                message += '(loopback address).'
            else:
                message += 'address not found.'
            print(message)

    snmp = config.exists('snmp enable')
    options["snmp"] = snmp
    if snmp:
        config.set_level('')
        options["sys_snmp"] = config.exists('service snmp')
        config.set_level(base)

    config.set_level(base + ['legacy-protocols'])
    options['cdp'] = config.exists('cdp')
    options['edp'] = config.exists('edp')
    options['fdp'] = config.exists('fdp')
    options['sonmp'] = config.exists('sonmp')

    # start with an unknown version information
    version_data = get_version_data()
    options['description'] = version_data['version']
    options['listen_on'] = []

    return options

def get_interface_list(config):
    config.set_level(base)
    intfs_names = config.list_nodes(['interface'])
    if len(intfs_names) < 0:
        return 0

    interface_list = []
    for name in intfs_names:
        config.set_level(base + ['interface', name])
        disable = config.exists(['disable'])
        intf = {
            'name': name,
            'disable': disable
        }
        interface_list.append(intf)
    return interface_list


def get_location_intf(config, name):
    path = base + ['interface', name]
    config.set_level(path)

    config.set_level(path + ['location'])
    elin = ''
    coordinate_based = {}

    if config.exists('elin'):
        elin = config.return_value('elin')

    if config.exists('coordinate-based'):
        config.set_level(path + ['location', 'coordinate-based'])

        coordinate_based['latitude'] = config.return_value(['latitude'])
        coordinate_based['longitude'] = config.return_value(['longitude'])

        coordinate_based['altitude'] = '0'
        if config.exists(['altitude']):
            coordinate_based['altitude'] = config.return_value(['altitude'])

        coordinate_based['datum'] = 'WGS84'
        if config.exists(['datum']):
            coordinate_based['datum'] = config.return_value(['datum'])

    intf = {
        'name': name,
        'elin': elin,
        'coordinate_based': coordinate_based

    }
    return intf


def get_location(config):
    config.set_level(base)
    intfs_names = config.list_nodes(['interface'])
    if len(intfs_names) < 0:
        return 0

    if config.exists('disable'):
        return 0

    intfs_location = []
    for name in intfs_names:
        intf = get_location_intf(config, name)
        intfs_location.append(intf)

    return intfs_location


def get_config():
    lldp = deepcopy(default_config_data)
    conf = Config()
    if not conf.exists(base):
        return None
    else:
        lldp['options'] = get_options(conf)
        lldp['interface_list'] = get_interface_list(conf)
        lldp['location'] = get_location(conf)

        return lldp


def verify(lldp):
    # bail out early - looks like removal from running config
    if lldp is None:
        return

    # check location
    for location in lldp['location']:
        # check coordinate-based
        if len(location['coordinate_based']) > 0:
            # check longitude and latitude
            if not location['coordinate_based']['longitude']:
                raise ConfigError('Must define longitude for interface {0}'.format(location['name']))

            if not location['coordinate_based']['latitude']:
                raise ConfigError('Must define latitude for interface {0}'.format(location['name']))

            if not re.match(r'^(\d+)(\.\d+)?[nNsS]$', location['coordinate_based']['latitude']):
                raise ConfigError('Invalid location for interface {0}:\n' \
                                  'latitude should be a number followed by S or N'.format(location['name']))

            if not re.match(r'^(\d+)(\.\d+)?[eEwW]$', location['coordinate_based']['longitude']):
                raise ConfigError('Invalid location for interface {0}:\n' \
                                  'longitude should be a number followed by E or W'.format(location['name']))

            # check altitude and datum if exist
            if location['coordinate_based']['altitude']:
                if not re.match(r'^[-+0-9\.]+$', location['coordinate_based']['altitude']):
                    raise ConfigError('Invalid location for interface {0}:\n' \
                                      'altitude should be a positive or negative number'.format(location['name']))

            if location['coordinate_based']['datum']:
                if not re.match(r'^(WGS84|NAD83|MLLW)$', location['coordinate_based']['datum']):
                    raise ConfigError("Invalid location for interface {0}:\n' \
                                      'datum should be WGS84, NAD83, or MLLW".format(location['name']))

        # check elin
        elif location['elin']:
            if not re.match(r'^[0-9]{10,25}$', location['elin']):
                raise ConfigError('Invalid location for interface {0}:\n' \
                                  'ELIN number must be between 10-25 numbers'.format(location['name']))

    # check options
    if lldp['options']['snmp']:
        if not lldp['options']['sys_snmp']:
            raise ConfigError('SNMP must be configured to enable LLDP SNMP')


def generate(lldp):
    # bail out early - looks like removal from running config
    if lldp is None:
        return

    # Prepare Jinja2 template loader from files
    tmpl_path = os.path.join(vyos_data_dir['data'], 'templates', 'lldp')
    fs_loader = FileSystemLoader(tmpl_path)
    env = Environment(loader=fs_loader)

    # generate listen on interfaces
    for intf in lldp['interface_list']:
        tmp = ''
        # add exclamation mark if interface is disabled
        if intf['disable']:
            tmp = '!'

        tmp += intf['name']
        lldp['options']['listen_on'].append(tmp)

    # generate /etc/default/lldpd
    tmpl = env.get_template('lldpd.tmpl')
    config_text = tmpl.render(lldp)
    with open(config_file, 'w') as f:
        f.write(config_text)

    # generate /etc/lldpd.d/01-vyos.conf
    tmpl = env.get_template('vyos.conf.tmpl')
    config_text = tmpl.render(lldp)
    with open(vyos_config_file, 'w') as f:
        f.write(config_text)


def apply(lldp):
    if lldp:
        # start/restart lldp service
        call('sudo systemctl restart lldpd.service')
    else:
        # LLDP service has been terminated
        call('sudo systemctl stop lldpd.service')
        os.unlink(config_file)
        os.unlink(vyos_config_file)

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