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bird-snmp-agent

Based on https://github.com/carosio/bird-snmp-agent

Forked by Mike Nowak (https://github.com/mikenowak)

What?

  • implements an SNMP-AgentX extension for the bird-routing-daemon

How?

To collect its data this agent:

  • uses birdc CLI of bird
  • calls ss to query information about used tcp-ports
  • reads bird's configuration files

Dependencies

The script depends on the following libraries:

  • dateutil
  • pytz
  • tzlocal

It also expects the snmp-mibs-downloader package.

All of these can be installed on Ubuntu as follows:

apt install python3-dateutil python3-tz python3-tzlocal snmp-mibs-downloader

Usage

Enable agentx support in snmp

Add the following line to snmpd.conf:

master	agentx
agentxperms 0770 0770 root snmp # if you intend to run this as an unprivileged user

Set bird's timestamp to iso8601 long

The script expect the timestamps to be in the iso8601 long format (YYYY-MM-DD HH:MM:SS)

To enable this, add the following to global section of bird.conf:

timeformat base iso long;
timeformat log iso long;
timeformat protocol iso long;
timeformat route iso long;

NB: Only protocol line is needed, the rest are optional, but keep the output from birdc consistent.

Add protocols in bird

The scripts expects to find both neighbour and local lines per protocol as in the example below:

protocol bgp PROTOCOL_NAME {
  neighbor 192.168.1.200 as 65502;
  local 192.168.1.100 as 65501;
  [...]
}

Settings

The script takes the following environment variables:

  • BIRDCONF path to bird.conf (defaults to '/etc/bird/bird.conf')
  • BIRDCLI name of birdcli exacutable (defaults to '/usr/sbin/birdc')
  • SSCMD ss command syntax (defaults to "ss -tan -o state established '( dport = :bgp or sport = :bgp )'")
  • BGPMIBFILE location of the BGP-MIB4 file (defaults to '/var/lib/mibs/ietf/BGP4-MIB')
  • AGENTCACHEINTERVAL how long to keep results cached in seconds (defaults to '30')

SystemD Unit File

[Unit]
Description=BIRD SNMP Agent
After=snmp.service
[Service]
PermissionsStartOnly = true
User = snmp
Group = snmp
WorkingDirectory = /usr/local/bird-snmp-agent
ExecStart = /usr/bin/env python3 /usr/local/bird-snmp-agent/bird_bgp.py
ExecReload = /bin/kill -s HUP $MAINPID
ExecStop = /bin/kill -s TERM $MAINPID
PrivateTmp = true

[Install]
WantedBy=multi-user.target

NB1: The snmp user needs to be a member of the bird group in order to query bird.

NB2: If you decide to run the script as a non-provileged user the following are also needed:

chgrp snmp /var/agentx
chmod 0750 /var/agentx