Periodically gathers and publishes statistics about iptables
Periodically gathers stats about iptables rules and sends them to different sinks (while currently only MQTT is supported). It is possible to count rules in chains, count number of packets/bytes processed by a rule and to count unique IPs in a ipset.
iptables_stat and it will run constantly, generate readings periodically and publish them to configured sinks.
The program is configured using a configuration file in YAML format. Default location is
/etc/iptable_stats.yml but a different location can be configured using the command line parameter
The config file consists of the section
general and a variable number of configuration sections for input modules and output sinks.
general: interval: 120 mqtt: host: myHost topic_root: home/myHost/iptables_stats iptables_pkg_count: firehol_level1: chain: FIREHOL_BLACKLIST rule_regex: .*match-set.firehol_level3.src.* firehol_level2: chain: FIREHOL_BLACKLIST rule_regex: .*match-set.firehol_level2.src.* firehol_level3: chain: FIREHOL_BLACKLIST rule_regex: .*match-set.firehol_level3.src.* ipset_count: firehol_level1: setname: firehol_level1 firehol_level2: setname: firehol_level2 firehol_level3: setname: firehol_level3 iptables_rule_count: f2b-traefik-auth: chain: f2b-traefik-auth offset: -1 f2b-traefik-botsearch: chain: f2b-traefik-botsearch offset: -1
This configuration contains three
iptables_pkg_count objects that will report iptables counters for the rules matching the given regular expressions. Also three
ipset_count objects that count the number of unique IPs in the ipsets
Last but not least two
iptables_rule_count objects that count the rules in the chains
fail2ban injects rules into these chains in case of a IP ban. Each rule represents a single IP. Both objects use an
-1 cause both chains contain a fixed
DROP rule that should not be counted.
Currntly only one sink is implemented
mqtt: host: myHost port: 1883 topic_root: home/myhost/iptables_stats
- port (optional) - defaults to 1883
- topic_root - string that defines the root topic that is used for publishing readings
Every module has a section in the configuration. In each of these sections object configurations can be defined using a user-defined object name. Every object configuration can override the gobal
interval parameter so it is possible to configure
interval for objects individually.
Reads counter statistics for a given rule and chain from
iptables and generates the readings
byte_count. Those represent the number of blocked packets and bytes.
- chain - Name of the chain
- rule_regex - Regex that matches the rule in question. It is matched against a string as the rule appears in the output of
iptables-save. The regex is not allowed to match more than one rule.
Counts the number of rules in a given chain and generates the reading
- chain - Name of the chain
- offset (optional) - An integer that is added to the value before publishing. This is useful to account for rules that should be ignored. E.g. there might be a drop rule which should not account towards the value. Set
-1to adjust to that.
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