docs: update changelog for release

Remove unnecessary name from the textfile import.
Remove the sqlite3 dependency which is no longer required.

.gitlab-ci.yml

@@ -1,22 +1,54 @@
 image: golang:latest
 
 before_script:
-  - make install-deps
+  - make go/dependencies
 
 stages:
   - test
-
-format:
-  stage: test
-  script:
-    - make format
+  - build
 
 dependencies:
   stage: test
   script:
-    - make go-mod-tidy
+    - make go/checkDependencies
+
+format:
+  stage: test
+  script:
+    - make go/checkFmt
 
 test:
   stage: test
   script:
-    - make test
+    - make go/test
+
+build:
+  stage: build
+  only:
+    - main
+    - tags
+  script:
+    - git fetch --tags
+    - make build/snapshot
+  artifacts:
+    paths:
+      - dist/*.tar.gz
+      - dist/checksums.txt
+    expire_in: 1 day
+
+docker/gitlab:
+  stage: build
+  only:
+    - main
+    - tags
+  image: docker:stable
+  services:
+    - docker:dind
+  before_script:
+    - apk add git
+    - apk add make
+    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+  script:
+    - make docker/build/latest
+    - make docker/build/tag
+    - docker push registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter

.goreleaser.yml

@@ -0,0 +1,30 @@
+# This is an example goreleaser.yaml file with some sane defaults.
+# Make sure to check the documentation at http://goreleaser.com
+before:
+  hooks:
+    - make go/dependencies
+builds:
+  -
+    dir: src
+    goos:
+      - linux
+      - darwin
+    goarch:
+      - amd64
+      - "386"
+      - arm
+      - arm64
+    goarm:
+      - "6"
+      - "7"
+
+archives:
+  -
+    files:
+    - LICENSE
+    - README.md
+    - CHANGELOG.md
+checksum:
+  name_template: 'checksums.txt'
+changelog:
+  skip: true

CHANGELOG.md

@@ -0,0 +1,72 @@
+# CHANGELOG
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog], and this project adheres to [Semantic Versioning].
+
+## [Unreleased]
+*Nothing yet*
+
+## [0.4.0] - 2021-10-18
+*Add new fail2ban config metrics*
+
+### Added
+- (56730c8) feat: add new jail config metrics
+- (5a107cc) feat: support for textfile metrics ([#13](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/issues/13))
+
+### Removed
+- (b268f86) remove: database-based metrics
+- (0b6a941) remove: windows builds
+
+## [0.3.0] - 2021-09-27
+*Export new version metrics ([#12](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/issues/12))*
+
+### Added
+- (3c9a005) feat: render basic html page at root url
+- (22a165d) feat: improve startup logging
+- (fba9ee2) feat: export new version metric ([#12](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/issues/12))
+
+## [0.2.0] - 2021-08-31
+*Collect metrics through fail2ban socket - based on [#11](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/issues/11)*
+
+### Added
+- (39133d0) feat: collect new up metric from fail2ban socket
+- (4da46f3) feat: export metrics with socket errors
+- (bd841c3) feat: set up metric to 0 if errors found
+- (1964dde) feat: export metrics for failed/banned counts
+- (2ab1f7d) feat: support reading fail2ban socket in docker
+- (1282d63) feat: new metric for enabled jails ([#1](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/issues/1))
+
+### Fixed
+- (526b1c7) fix: update banned metrics to exclude expired bans ([#11](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/issues/11))
+
+### Deprecated
+- Use of the fail2ban database has been deprecated. The exporter now collects metrics through the fail2ban socket file. See [#11](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/issues/11) for more details.
+
+## [0.1.0] - 2021-03-28
+*Initial release*
+
+### Added
+- (6355c9e) feat: fail on startup if database file does not exist ([#8](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/issues/8))
+- (4f18bf3) feat: add cli parameters for db path and metrics port ([#4](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/issues/4))
+- (91cba80) feat: export number of banned ips
+- (4b96501) feat: export bad ip count per jail
+- (0b40e5d) feat: connect to fail2ban db and extract total bad ips
+- (7ced846) feat: initial setup of metric exporter
+
+
+### Fixed
+- (0842419) fix: compile tool without cgo_enabled flag
+
+## 0.0.0 - 2021-02-05
+*Repository creation*
+
+---
+
+[Keep a Changelog]: https://keepachangelog.com/en/1.0.0/
+[Semantic Versioning]: https://semver.org/spec/v2.0.0.html
+[Unreleased]: https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/compare/0.1.0...main
+[0.1.0]: https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/compare/0.0.0...0.1.0
+[0.2.0]: https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/compare/0.1.0...0.2.0
+[0.3.0]: https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/compare/0.2.0...0.3.0
+[0.4.0]: https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/compare/0.3.0...0.4.0

Dockerfile

@@ -0,0 +1,26 @@
+# Using golang:latest instead of alpine because of issues with sqlite3
+FROM golang:latest AS build
+
+# Create build folder to compile tool
+WORKDIR /build
+
+# Copy source files to build folder and link to the /go folder
+COPY . /build
+RUN ln -s /go/src/ /build/src
+
+# Compile the tool using a Make command
+RUN make build/docker
+
+
+FROM debian:buster-slim
+
+# Create main app folder to run from
+WORKDIR /app
+
+# Copy compiled binary to release image
+COPY --from=build /build/src/exporter /app/fail2ban-prometheus-exporter
+
+# Copy init script into main app folder and set as entry point
+COPY docker/run.sh /app/
+RUN chmod +x /app/*
+ENTRYPOINT /app/run.sh

Makefile

@@ -1,15 +1,36 @@
-install-deps:
-	go mod download
-
-# Standard go test
-test:
-	go test ./... -v -race
+go/dependencies:
+	cd src/ && go mod download
 
 # Make sure no unnecessary dependencies are present
-go-mod-tidy:
-	go mod tidy -v
+go/checkDependencies:
+	cd src/ && go mod tidy -v
 	git diff-index --quiet HEAD
 
-format:
-	go fmt $(go list ./... | grep -v /vendor/)
-	go vet $(go list ./... | grep -v /vendor/)
+# Standard go test
+go/test:
+	cd src/ && go test ./... -v -race
+
+go/fmt:
+	cd src/ && go fmt ./...
+
+go/checkFmt:
+	test -z $(shell gofmt -l .)
+
+docs/genChangelog:
+	./tools/git-chglog_linux_amd64 --config tools/chglog/config.yml 0.0.0.. > CHANGELOG_gen.md
+
+build/snapshot:
+	./tools/goreleaser_linux_amd64 --snapshot --rm-dist --skip-publish
+
+build/release:
+	./tools/goreleaser_linux_amd64 --rm-dist --skip-publish
+
+build/docker:
+	cd src/ && go build -o exporter \
+     -ldflags '-X main.version=$(shell git describe --tags) -X main.commit=${shell git rev-parse HEAD} -X "main.date=${shell date --rfc-3339=seconds}" -X main.builtBy=docker' exporter.go
+
+docker/build/latest:
+	docker build -t registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:latest .
+
+docker/build/tag:
+	docker build -t registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:$(shell git describe --tags) .

README.md

@@ -1,3 +1,227 @@
 # Fail2Ban Prometheus Exporter
 
 Go tool to collect and export metrics on Fail2Ban
+
+## Table of Contents
+1. Introduction
+2. Running the Exporter
+3. Running in Docker
+4. Metrics
+
+## 1. Introduction
+The exporter can collect metrics from 2 locations: the fail2ban server socket and the fail2ban server database.
+
+Once the exporter is running, metrics are available at `localhost:9191/metrics`.
+
+(The default port is `9191` but can be modified with the `-port` flag)
+
+The exporter communicates with the fail2ban server over its socket.
+This allows the data collected by the exporter to always align with the output of the `fail2ban-client`.
+
+The default location of the socket is: `/var/run/fail2ban/fail2ban.sock`
+
+## 2. Running the Exporter
+
+The exporter is compiled and released as a single binary.
+This makes it very easy to run in any environment.
+No additional runtime dependencies are required.
+
+Compiled binaries for various platforms are provided in each release.
+See the [releases page](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/releases) for more information.
+
+**Usage**
+```
+$ fail2ban-prometheus-exporter -h
+
+  -port int
+        port to use for the metrics server (default 9191)
+  -socket string
+        path to the fail2ban server socket
+  -version
+        show version info and exit
+  -collector.textfile
+        enable the textfile collector
+  -collector.textfile.directory string
+        directory to read text files with metrics from
+```
+
+**Example**
+
+```
+fail2ban-prometheus-exporter -socket /var/run/fail2ban/fail2ban.sock -port 9191
+```
+
+Note that the exporter will need read access to the fail2ban socket.
+
+### 2.1. Compile from Source
+
+The code can be compiled from source by running `go build` inside the `src/` folder.
+Go version `1.15` or greater is required.
+
+Run `go mod download` to download all necessary dependencies before running the build.
+
+## 3. Running in Docker
+
+An official docker image is available on the Gitlab container registry.
+Use it by pulling the following image:
+
+```
+registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:latest
+```
+
+Use the `:latest` tag to get the most up to date code (less stable) or use one of the version tagged images to use a specific release.
+See the [registry page](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/container_registry) for all available tags.
+
+### 3.1. Volumes
+
+The docker image is designed to run by mounting the fail2ban run folder.
+The run folder should be mounted in the container at: `/var/run/fail2ban`.
+
+The folder can be mounted with read-only (`ro`) permissions.
+
+**NOTE:** While it is possible to mount the `fail2ban.sock` file directly, it is recommended to mount the parent folder instead.
+The `.sock` file is deleted by fail2ban on shutdown and re-created on startup and this causes problems for the docker mount.
+See [this reply](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/issues/11#note_665003499) for more details.
+
+### 3.2. Docker run
+
+Use the following command to run the exporter as a docker container.
+
+```
+docker run -d \
+    --name "fail2ban-exporter" \
+    -v /var/run/fail2ban:/var/run/fail2ban:ro \
+    -p "9191:9191" \
+    registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:latest
+```
+
+### 3.3. Docker compose
+
+The following is a simple docker-compose file to run the exporter.
+
+```
+version: "2"
+services:
+  exporter:
+    image: registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:latest
+    volumes:
+    - /var/run/fail2ban/:/var/run/fail2ban:ro
+    ports:
+    - "9191:9191"
+```
+
+## 4. Metrics
+
+Access exported metrics at the `/metrics` path on the configured port.
+
+**Note on Fail2Ban Jails**
+
+fail2ban can be configured to process different log files and use different rules for each one.
+These separate configurations are referred to as *jails*.
+
+For example, fail2ban can be configured to watch the system logs for failed SSH connections and Nextcloud logs for failed logins.
+In this configuration, there will be two jails - one for IPs banned from the SSH logs, and one for IPs banned from the Nextcloud logs.
+
+This tool exports several metrics *per jail*, meaning that it is possible to track how many IPs are being banned in each jail as well as the overall total.
+This can be useful to track what services are seeing more failed logins.
+
+### 4.1. Socket-based Metrics
+
+These are the metrics exported by reading data from the fail2ban server socket.
+All metrics are prefixed with `f2b_`.
+
+Exposed metrics:
+* `up` - Returns 1 if the fail2ban server is up and connection succeeds
+* `errors` - Number of errors since startup
+    * `db` - Errors connecting to the database
+    * `socket_conn` - Errors connecting to the fail2ban socket (e.g. connection refused)
+    * `socket_req` - Errors sending requests to the fail2ban server (e.g. invalid responses)
+* `jail_count` - Number of jails configured in fail2ban
+* `jail_banned_current` (per jail) - Number of IPs currently banned
+* `jail_banned_total` (per jail) - Total number of banned IPs since fail2ban startup (includes expired bans)
+* `jail_failed_current` (per jail) - Number of current failures
+* `jail_failed_total` (per jail) - Total number of failures since fail2ban startup
+* `jail_config_ban_time` (per jail) - How long an IP is banned for in this jail (in seconds)
+* `jail_config_find_time` (per jail) - How far back the filter will look for failures in this jail (in seconds)
+* `jail_config_max_retry` (per jail) - The max number of failures allowed before banning an IP in this jail
+* `version` - Version string of the exporter and fail2ban
+
+**Sample**
+
+```
+# HELP f2b_errors Number of errors found since startup
+# TYPE f2b_errors counter
+f2b_errors{type="db"} 0
+f2b_errors{type="socket_conn"} 0
+f2b_errors{type="socket_req"} 0
+# HELP f2b_jail_banned_current Number of IPs currently banned in this jail
+# TYPE f2b_jail_banned_current gauge
+f2b_jail_banned_current{jail="recidive"} 5
+f2b_jail_banned_current{jail="sshd"} 15
+# HELP f2b_jail_banned_total Total number of IPs banned by this jail (includes expired bans)
+# TYPE f2b_jail_banned_total gauge
+f2b_jail_banned_total{jail="recidive"} 6
+f2b_jail_banned_total{jail="sshd"} 31
+# HELP f2b_jail_count Number of defined jails
+# TYPE f2b_jail_count gauge
+f2b_jail_count 2
+# HELP f2b_jail_failed_current Number of current failures on this jail's filter
+# TYPE f2b_jail_failed_current gauge
+f2b_jail_failed_current{jail="recidive"} 5
+f2b_jail_failed_current{jail="sshd"} 6
+# HELP f2b_jail_failed_total Number of total failures on this jail's filter
+# TYPE f2b_jail_failed_total gauge
+f2b_jail_failed_total{jail="recidive"} 7
+f2b_jail_failed_total{jail="sshd"} 125
+# HELP f2b_config_jail_ban_time How long an IP is banned for in this jail (in seconds)
+# TYPE f2b_config_jail_ban_time gauge
+f2b_config_jail_ban_time{jail="recidive"} 604800
+f2b_config_jail_ban_time{jail="sshd"} 600
+# HELP f2b_config_jail_find_time How far back will the filter look for failures in this jail (in seconds)
+# TYPE f2b_config_jail_find_time gauge
+f2b_config_jail_find_time{jail="recidive"} 86400
+f2b_config_jail_find_time{jail="sshd"} 600
+# HELP f2b_config_jail_max_retries The number of failures allowed until the IP is banned by this jail
+# TYPE f2b_config_jail_max_retries gauge
+f2b_config_jail_max_retries{jail="recidive"} 5
+f2b_config_jail_max_retries{jail="sshd"} 5
+# HELP f2b_up Check if the fail2ban server is up
+# TYPE f2b_up gauge
+f2b_up 1
+# HELP f2b_version Version of the exporter and fail2ban server
+# TYPE f2b_version gauge
+f2b_version{exporter="0.3.0",fail2ban="0.11.1"} 1
+```
+
+The metrics above correspond to the matching fields in the `fail2ban-client status <jail>` command:
+```
+Status for the jail: sshd|- Filter
+|  |- Currently failed: 6
+|  |- Total failed:     125
+|  `- File list:        /var/log/auth.log
+`- Actions
+   |- Currently banned: 15
+   |- Total banned:     31
+   `- Banned IP list:   ...
+```
+
+### 4.2. Textfile Metrics
+
+For more flexibility the exporter also allows exporting metrics collected from a text file.
+
+To enable textfile metrics:
+1. Enable the collector with `-collector.textfile=true`
+2. Provide the directory to read files from with the `-collector.textfile.directory` flag
+
+Metrics collected from these files will be exposed directly alongside the other metrics without any additional processing.
+This means that it is the responsibility of the file creator to ensure the format is correct.
+
+By exporting textfile metrics an extra metric is also exported with an error count for each file:
+
+```
+# HELP textfile_error Checks for errors while reading text files
+# TYPE textfile_error gauge
+textfile_error{path="file.prom"} 0
+```
+
+**NOTE:** Any file not ending with `.prom` will be ignored.

docker/run.sh

@@ -0,0 +1,20 @@
+#/bin/sh
+
+# Print version to logs for debugging purposes
+/app/fail2ban-prometheus-exporter -version
+
+socket_path=/var/run/fail2ban/fail2ban.sock
+textfile_dir=/app/textfile/
+textfile_enabled=false
+
+# Enable textfile metrics if the folder exists (i.e. was mounted by docker)
+if [ -d $textfile_dir ]; then
+    textfile_enabled=true
+fi
+
+# Start the exporter (use exec to support graceful shutdown)
+# Inspired by: https://akomljen.com/stopping-docker-containers-gracefully/
+exec /app/fail2ban-prometheus-exporter \
+    -socket "$socket_path" \
+    -collector.textfile=$textfile_enabled \
+    -collector.textfile.directory="$textfile_dir"

exporter.go

@@ -1,7 +0,0 @@
-package main
-
-import "log"
-
-func main() {
-	log.Println("Not yet implemented")
-}

go.mod

@@ -1,3 +0,0 @@
-module fail2ban-prometheus-exporter
-
-go 1.15

src/cfg/cfg.go

@@ -0,0 +1,59 @@
+package cfg
+
+import (
+	"flag"
+	"fmt"
+	"os"
+)
+
+const (
+	minServerPort = 1000
+	maxServerPort = 65535
+)
+
+type AppSettings struct {
+	VersionMode          bool
+	MetricsPort          int
+	Fail2BanSocketPath   string
+	FileCollectorPath    string
+	FileCollectorEnabled bool
+}
+
+func Parse() *AppSettings {
+	appSettings := &AppSettings{}
+	flag.BoolVar(&appSettings.VersionMode, "version", false, "show version info and exit")
+	flag.IntVar(&appSettings.MetricsPort, "port", 9191, "port to use for the metrics server")
+	flag.StringVar(&appSettings.Fail2BanSocketPath, "socket", "", "path to the fail2ban server socket")
+	flag.BoolVar(&appSettings.FileCollectorEnabled, "collector.textfile", false, "enable the textfile collector")
+	flag.StringVar(&appSettings.FileCollectorPath, "collector.textfile.directory", "", "directory to read text files with metrics from")
+
+	// deprecated: to be removed in next version
+	_ = flag.String("db", "", "path to the fail2ban sqlite database (removed)")
+
+	flag.Parse()
+	appSettings.validateFlags()
+	return appSettings
+}
+
+func (settings *AppSettings) validateFlags() {
+	var flagsValid = true
+	if !settings.VersionMode {
+		if settings.Fail2BanSocketPath == "" {
+			fmt.Println("fail2ban socket path must not be blank")
+			flagsValid = false
+		}
+		if settings.MetricsPort < minServerPort || settings.MetricsPort > maxServerPort {
+			fmt.Printf("invalid server port, must be within %d and %d (found %d)\n",
+				minServerPort, maxServerPort, settings.MetricsPort)
+			flagsValid = false
+		}
+		if settings.FileCollectorEnabled && settings.FileCollectorPath == "" {
+			fmt.Printf("file collector directory path must not be empty if collector enabled\n")
+			flagsValid = false
+		}
+	}
+	if !flagsValid {
+		flag.Usage()
+		os.Exit(1)
+	}
+}

src/collector/f2b/collector.go

@@ -0,0 +1,55 @@
+package f2b
+
+import (
+	"fail2ban-prometheus-exporter/cfg"
+	"fail2ban-prometheus-exporter/socket"
+	"github.com/prometheus/client_golang/prometheus"
+	"log"
+)
+
+type Collector struct {
+	socketPath                 string
+	exporterVersion            string
+	lastError                  error
+	dbErrorCount               int
+	socketConnectionErrorCount int
+	socketRequestErrorCount    int
+}
+
+func NewExporter(appSettings *cfg.AppSettings, exporterVersion string) *Collector {
+	return &Collector{
+		socketPath:                 appSettings.Fail2BanSocketPath,
+		exporterVersion:            exporterVersion,
+		lastError:                  nil,
+		dbErrorCount:               0,
+		socketConnectionErrorCount: 0,
+		socketRequestErrorCount:    0,
+	}
+}
+
+func (c *Collector) Describe(ch chan<- *prometheus.Desc) {
+	ch <- metricServerUp
+	ch <- metricJailCount
+	ch <- metricJailFailedCurrent
+	ch <- metricJailFailedTotal
+	ch <- metricJailBannedCurrent
+	ch <- metricJailBannedTotal
+	ch <- metricErrorCount
+}
+
+func (c *Collector) Collect(ch chan<- prometheus.Metric) {
+	s, err := socket.ConnectToSocket(c.socketPath)
+	if err != nil {
+		log.Printf("error opening socket: %v", err)
+		c.socketConnectionErrorCount++
+	} else {
+		defer s.Close()
+	}
+
+	c.collectServerUpMetric(ch, s)
+	if err == nil && s != nil {
+		c.collectJailMetrics(ch, s)
+		c.collectVersionMetric(ch, s)
+	}
+	c.collectErrorCountMetric(ch)
+}

src/collector/f2b/socket.go

@@ -0,0 +1,182 @@
+package f2b
+
+import (
+	"fail2ban-prometheus-exporter/socket"
+	"github.com/prometheus/client_golang/prometheus"
+	"log"
+)
+
+const (
+	namespace = "f2b"
+)
+
+var (
+	metricErrorCount = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "errors"),
+		"Number of errors found since startup",
+		[]string{"type"}, nil,
+	)
+	metricServerUp = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "up"),
+		"Check if the fail2ban server is up",
+		nil, nil,
+	)
+	metricJailCount = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "jail_count"),
+		"Number of defined jails",
+		nil, nil,
+	)
+	metricJailFailedCurrent = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "jail_failed_current"),
+		"Number of current failures on this jail's filter",
+		[]string{"jail"}, nil,
+	)
+	metricJailFailedTotal = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "jail_failed_total"),
+		"Number of total failures on this jail's filter",
+		[]string{"jail"}, nil,
+	)
+	metricJailBannedCurrent = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "jail_banned_current"),
+		"Number of IPs currently banned in this jail",
+		[]string{"jail"}, nil,
+	)
+	metricJailBannedTotal = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "jail_banned_total"),
+		"Total number of IPs banned by this jail (includes expired bans)",
+		[]string{"jail"}, nil,
+	)
+	metricJailBanTime = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "config", "jail_ban_time"),
+		"How long an IP is banned for in this jail (in seconds)",
+		[]string{"jail"}, nil,
+	)
+	metricJailFindTime = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "config", "jail_find_time"),
+		"How far back will the filter look for failures in this jail (in seconds)",
+		[]string{"jail"}, nil,
+	)
+	metricJailMaxRetry = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "config", "jail_max_retries"),
+		"The number of failures allowed until the IP is banned by this jail",
+		[]string{"jail"}, nil,
+	)
+	metricVersionInfo = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "version"),
+		"Version of the exporter and fail2ban server",
+		[]string{"exporter", "fail2ban"}, nil,
+	)
+)
+
+func (c *Collector) collectErrorCountMetric(ch chan<- prometheus.Metric) {
+	ch <- prometheus.MustNewConstMetric(
+		metricErrorCount, prometheus.CounterValue, float64(c.dbErrorCount), "db",
+	)
+	ch <- prometheus.MustNewConstMetric(
+		metricErrorCount, prometheus.CounterValue, float64(c.socketConnectionErrorCount), "socket_conn",
+	)
+	ch <- prometheus.MustNewConstMetric(
+		metricErrorCount, prometheus.CounterValue, float64(c.socketRequestErrorCount), "socket_req",
+	)
+}
+
+func (c *Collector) collectServerUpMetric(ch chan<- prometheus.Metric, s *socket.Fail2BanSocket) {
+	var serverUp float64 = 0
+	if s != nil {
+		pingSuccess, err := s.Ping()
+		if err != nil {
+			c.socketRequestErrorCount++
+			log.Print(err)
+		}
+		if err == nil && pingSuccess {
+			serverUp = 1
+		}
+	}
+	ch <- prometheus.MustNewConstMetric(
+		metricServerUp, prometheus.GaugeValue, serverUp,
+	)
+}
+
+func (c *Collector) collectJailMetrics(ch chan<- prometheus.Metric, s *socket.Fail2BanSocket) {
+	jails, err := s.GetJails()
+	var count float64 = 0
+	if err != nil {
+		c.socketRequestErrorCount++
+		log.Print(err)
+	}
+	if err == nil {
+		count = float64(len(jails))
+	}
+	ch <- prometheus.MustNewConstMetric(
+		metricJailCount, prometheus.GaugeValue, count,
+	)
+
+	for i := range jails {
+		c.collectJailStatsMetric(ch, s, jails[i])
+		c.collectJailConfigMetrics(ch, s, jails[i])
+	}
+}
+
+func (c *Collector) collectJailStatsMetric(ch chan<- prometheus.Metric, s *socket.Fail2BanSocket, jail string) {
+	stats, err := s.GetJailStats(jail)
+	if err != nil {
+		c.socketRequestErrorCount++
+		log.Printf("failed to get stats for jail %s: %v", jail, err)
+		return
+	}
+
+	ch <- prometheus.MustNewConstMetric(
+		metricJailFailedCurrent, prometheus.GaugeValue, float64(stats.FailedCurrent), jail,
+	)
+	ch <- prometheus.MustNewConstMetric(
+		metricJailFailedTotal, prometheus.GaugeValue, float64(stats.FailedTotal), jail,
+	)
+	ch <- prometheus.MustNewConstMetric(
+		metricJailBannedCurrent, prometheus.GaugeValue, float64(stats.BannedCurrent), jail,
+	)
+	ch <- prometheus.MustNewConstMetric(
+		metricJailBannedTotal, prometheus.GaugeValue, float64(stats.BannedTotal), jail,
+	)
+}
+
+func (c *Collector) collectJailConfigMetrics(ch chan<- prometheus.Metric, s *socket.Fail2BanSocket, jail string) {
+	banTime, err := s.GetJailBanTime(jail)
+	if err != nil {
+		c.socketRequestErrorCount++
+		log.Printf("failed to get ban time for jail %s: %v", jail, err)
+	} else {
+		ch <- prometheus.MustNewConstMetric(
+			metricJailBanTime, prometheus.GaugeValue, float64(banTime), jail,
+		)
+	}
+	findTime, err := s.GetJailFindTime(jail)
+	if err != nil {
+		c.socketRequestErrorCount++
+		log.Printf("failed to get find time for jail %s: %v", jail, err)
+	} else {
+		ch <- prometheus.MustNewConstMetric(
+			metricJailFindTime, prometheus.GaugeValue, float64(findTime), jail,
+		)
+	}
+	maxRetry, err := s.GetJailMaxRetries(jail)
+	if err != nil {
+		c.socketRequestErrorCount++
+		log.Printf("failed to get max retries for jail %s: %v", jail, err)
+	} else {
+		ch <- prometheus.MustNewConstMetric(
+			metricJailMaxRetry, prometheus.GaugeValue, float64(maxRetry), jail,
+		)
+	}
+}
+
+func (c *Collector) collectVersionMetric(ch chan<- prometheus.Metric, s *socket.Fail2BanSocket) {
+	fail2banVersion, err := s.GetServerVersion()
+	if err != nil {
+		c.socketRequestErrorCount++
+		log.Printf("failed to get fail2ban server version: %v", err)
+	}
+
+	ch <- prometheus.MustNewConstMetric(
+		metricVersionInfo, prometheus.GaugeValue, float64(1), c.exporterVersion, fail2banVersion,
+	)
+}

src/collector/textfile/collector.go

@@ -0,0 +1,48 @@
+package textfile
+
+import (
+	"fail2ban-prometheus-exporter/cfg"
+	"github.com/prometheus/client_golang/prometheus"
+	"log"
+)
+
+type Collector struct {
+	enabled    bool
+	folderPath string
+	fileMap    map[string]*fileData
+}
+
+type fileData struct {
+	readErrors   int
+	fileName     string
+	fileContents []byte
+}
+
+func NewCollector(appSettings *cfg.AppSettings) *Collector {
+	collector := &Collector{
+		enabled:    appSettings.FileCollectorEnabled,
+		folderPath: appSettings.FileCollectorPath,
+		fileMap:    make(map[string]*fileData),
+	}
+	if collector.enabled {
+		log.Printf("collector.textfile directory: %s", collector.folderPath)
+	}
+	return collector
+}
+
+func (c *Collector) Describe(ch chan<- *prometheus.Desc) {
+	if c.enabled {
+		ch <- metricReadError
+	}
+}
+
+func (c *Collector) Collect(ch chan<- prometheus.Metric) {
+	if c.enabled {
+		c.collectFileContents()
+		c.collectFileErrors(ch)
+	}
+}
+
+func (c *Collector) appendErrorForPath(path string) {
+	c.fileMap[path].readErrors++
+}

src/collector/textfile/file.go

@@ -0,0 +1,55 @@
+package textfile
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+	"io/ioutil"
+	"log"
+	"path/filepath"
+	"strings"
+)
+
+const namespace = "textfile"
+
+var (
+	metricReadError = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "error"),
+		"Checks for errors while reading text files",
+		[]string{"path"}, nil,
+	)
+)
+
+func (c *Collector) collectFileContents() {
+	files, err := ioutil.ReadDir(c.folderPath)
+	if err != nil {
+		log.Printf("error reading directory '%s': %v", c.folderPath, err)
+		return
+	}
+
+	for _, file := range files {
+		fileName := file.Name()
+		if !strings.HasSuffix(strings.ToLower(fileName), ".prom") {
+			continue
+		}
+		c.fileMap[fileName] = &fileData{
+			readErrors: 0,
+			fileName:   fileName,
+		}
+
+		fullPath := filepath.Join(c.folderPath, fileName)
+		content, err := ioutil.ReadFile(fullPath)
+		if err != nil {
+			c.appendErrorForPath(fileName)
+			log.Printf("error reading contents of file '%s': %v", fileName, err)
+		}
+
+		c.fileMap[fileName].fileContents = content
+	}
+}
+
+func (c *Collector) collectFileErrors(ch chan<- prometheus.Metric) {
+	for _, f := range c.fileMap {
+		ch <- prometheus.MustNewConstMetric(
+			metricReadError, prometheus.GaugeValue, float64(f.readErrors), f.fileName,
+		)
+	}
+}

src/collector/textfile/writer.go

@@ -0,0 +1,20 @@
+package textfile
+
+import (
+	"log"
+	"net/http"
+)
+
+func (c *Collector) WriteTextFileMetrics(w http.ResponseWriter, r *http.Request) {
+	if !c.enabled {
+		return
+	}
+
+	for _, f := range c.fileMap {
+		_, err := w.Write(f.fileContents)
+		if err != nil {
+			c.appendErrorForPath(f.fileName)
+			log.Printf("error writing file contents to response writer '%s': %v", f.fileName, err)
+		}
+	}
+}

src/exporter.go

@@ -0,0 +1,81 @@
+package main
+
+import (
+	"fail2ban-prometheus-exporter/cfg"
+	"fail2ban-prometheus-exporter/collector/f2b"
+	"fail2ban-prometheus-exporter/collector/textfile"
+	"fmt"
+	"log"
+	"net/http"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+const (
+	metricsPath = "/metrics"
+)
+
+var (
+	version = "dev"
+	commit  = "none"
+	date    = "unknown"
+	builtBy = "unknown"
+)
+
+func printAppVersion() {
+	fmt.Println(version)
+	fmt.Printf("    build date:  %s\r\n    commit hash: %s\r\n    built by:    %s\r\n", date, commit, builtBy)
+}
+
+func rootHtmlHandler(w http.ResponseWriter, r *http.Request) {
+	_, err := w.Write([]byte(
+		`<html>
+			<head><title>Fail2Ban Exporter</title></head>
+			<body>
+			<h1>Fail2Ban Exporter</h1>
+			<p><a href="` + metricsPath + `">Metrics</a></p>
+			</body>
+		</html>`))
+	if err != nil {
+		log.Printf("error handling root url: %v", err)
+		w.WriteHeader(http.StatusInternalServerError)
+	}
+}
+
+func metricHandler(w http.ResponseWriter, r *http.Request, collector *textfile.Collector) {
+	promhttp.Handler().ServeHTTP(w, r)
+	collector.WriteTextFileMetrics(w, r)
+}
+
+func main() {
+	appSettings := cfg.Parse()
+	if appSettings.VersionMode {
+		printAppVersion()
+	} else {
+		addr := fmt.Sprintf("0.0.0.0:%d", appSettings.MetricsPort)
+
+		log.Printf("starting fail2ban exporter at %s", addr)
+
+		f2bCollector := f2b.NewExporter(appSettings, version)
+		prometheus.MustRegister(f2bCollector)
+
+		textFileCollector := textfile.NewCollector(appSettings)
+		prometheus.MustRegister(textFileCollector)
+
+		http.HandleFunc("/", rootHtmlHandler)
+		http.HandleFunc(metricsPath, func(w http.ResponseWriter, r *http.Request) {
+			metricHandler(w, r, textFileCollector)
+		})
+		log.Printf("metrics available at '%s'", metricsPath)
+
+		svrErr := make(chan error)
+		go func() {
+			svrErr <- http.ListenAndServe(addr, nil)
+		}()
+		log.Print("ready")
+
+		err := <-svrErr
+		log.Print(err)
+	}
+}

src/go.mod

@@ -0,0 +1,9 @@
+module fail2ban-prometheus-exporter
+
+go 1.15
+
+require (
+	github.com/kisielk/og-rek v1.1.0
+	github.com/nlpodyssey/gopickle v0.1.0
+	github.com/prometheus/client_golang v1.9.0
+)

src/go.sum

@@ -0,0 +1,404 @@
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src/socket/decoder.go

@@ -0,0 +1,8 @@
+package socket
+
+// Py_builtins_str is used by the pickle decoder to parse the server response into a format Go can understand
+type Py_builtins_str struct{}
+
+func (c Py_builtins_str) Call(args ...interface{}) (interface{}, error) {
+	return args[0], nil
+}

src/socket/fail2banSocket.go

@@ -0,0 +1,179 @@
+package socket
+
+import (
+	"fmt"
+	"github.com/kisielk/og-rek"
+	"github.com/nlpodyssey/gopickle/types"
+	"net"
+	"strings"
+)
+
+type Fail2BanSocket struct {
+	socket  net.Conn
+	encoder *ogórek.Encoder
+}
+
+type JailStats struct {
+	FailedCurrent int
+	FailedTotal   int
+	BannedCurrent int
+	BannedTotal   int
+}
+
+func ConnectToSocket(path string) (*Fail2BanSocket, error) {
+	c, err := net.Dial("unix", path)
+	if err != nil {
+		return nil, err
+	}
+	return &Fail2BanSocket{
+		socket:  c,
+		encoder: ogórek.NewEncoder(c),
+	}, nil
+}
+
+func (s *Fail2BanSocket) Close() error {
+	return s.socket.Close()
+}
+
+func (s *Fail2BanSocket) Ping() (bool, error) {
+	response, err := s.sendCommand([]string{pingCommand, "100"})
+	if err != nil {
+		return false, newConnectionError(pingCommand, err)
+	}
+
+	if t, ok := response.(*types.Tuple); ok {
+		if (*t)[1] == "pong" {
+			return true, nil
+		}
+		return false, fmt.Errorf("unexpected response data (expecting 'pong'): %s", (*t)[1])
+	}
+	return false, newBadFormatError(pingCommand, response)
+}
+
+func (s *Fail2BanSocket) GetJails() ([]string, error) {
+	response, err := s.sendCommand([]string{statusCommand})
+	if err != nil {
+		return nil, err
+	}
+
+	if lvl1, ok := response.(*types.Tuple); ok {
+		if lvl2, ok := lvl1.Get(1).(*types.List); ok {
+			if lvl3, ok := lvl2.Get(1).(*types.Tuple); ok {
+				if lvl4, ok := lvl3.Get(1).(string); ok {
+					splitJails := strings.Split(lvl4, ",")
+					return trimSpaceForAll(splitJails), nil
+				}
+			}
+		}
+	}
+	return nil, newBadFormatError(statusCommand, response)
+}
+
+func (s *Fail2BanSocket) GetJailStats(jail string) (JailStats, error) {
+	response, err := s.sendCommand([]string{statusCommand, jail})
+	if err != nil {
+		return JailStats{}, err
+	}
+
+	stats := JailStats{
+		FailedCurrent: -1,
+		FailedTotal:   -1,
+		BannedCurrent: -1,
+		BannedTotal:   -1,
+	}
+
+	if lvl1, ok := response.(*types.Tuple); ok {
+		if lvl2, ok := lvl1.Get(1).(*types.List); ok {
+			if filter, ok := lvl2.Get(0).(*types.Tuple); ok {
+				if filterLvl1, ok := filter.Get(1).(*types.List); ok {
+					if filterCurrentTuple, ok := filterLvl1.Get(0).(*types.Tuple); ok {
+						if filterCurrent, ok := filterCurrentTuple.Get(1).(int); ok {
+							stats.FailedCurrent = filterCurrent
+						}
+					}
+					if filterTotalTuple, ok := filterLvl1.Get(1).(*types.Tuple); ok {
+						if filterTotal, ok := filterTotalTuple.Get(1).(int); ok {
+							stats.FailedTotal = filterTotal
+						}
+					}
+				}
+			}
+			if actions, ok := lvl2.Get(1).(*types.Tuple); ok {
+				if actionsLvl1, ok := actions.Get(1).(*types.List); ok {
+					if actionsCurrentTuple, ok := actionsLvl1.Get(0).(*types.Tuple); ok {
+						if actionsCurrent, ok := actionsCurrentTuple.Get(1).(int); ok {
+							stats.BannedCurrent = actionsCurrent
+						}
+					}
+					if actionsTotalTuple, ok := actionsLvl1.Get(1).(*types.Tuple); ok {
+						if actionsTotal, ok := actionsTotalTuple.Get(1).(int); ok {
+							stats.BannedTotal = actionsTotal
+						}
+					}
+				}
+			}
+			return stats, nil
+		}
+	}
+	return stats, newBadFormatError(statusCommand, response)
+}
+
+func (s *Fail2BanSocket) GetJailBanTime(jail string) (int, error) {
+	command := fmt.Sprintf(banTimeCommandFmt, jail)
+	return s.sendSimpleIntCommand(command)
+}
+
+func (s *Fail2BanSocket) GetJailFindTime(jail string) (int, error) {
+	command := fmt.Sprintf(findTimeCommandFmt, jail)
+	return s.sendSimpleIntCommand(command)
+}
+
+func (s *Fail2BanSocket) GetJailMaxRetries(jail string) (int, error) {
+	command := fmt.Sprintf(maxRetriesCommandFmt, jail)
+	return s.sendSimpleIntCommand(command)
+}
+
+func (s *Fail2BanSocket) GetServerVersion() (string, error) {
+	response, err := s.sendCommand([]string{versionCommand})
+	if err != nil {
+		return "", err
+	}
+
+	if lvl1, ok := response.(*types.Tuple); ok {
+		if versionStr, ok := lvl1.Get(1).(string); ok {
+			return versionStr, nil
+		}
+	}
+	return "", newBadFormatError(versionCommand, response)
+}
+
+// sendSimpleIntCommand sends a command to the fail2ban socket and parses the response to extract an int.
+// This command assumes that the response data is in the format of `(d, d)` where `d` is a number.
+func (s *Fail2BanSocket) sendSimpleIntCommand(command string) (int, error) {
+	response, err := s.sendCommand(strings.Split(command, " "))
+	if err != nil {
+		return -1, err
+	}
+
+	if lvl1, ok := response.(*types.Tuple); ok {
+		if banTime, ok := lvl1.Get(1).(int); ok {
+			return banTime, nil
+		}
+	}
+	return -1, newBadFormatError(command, response)
+}
+
+func newBadFormatError(command string, data interface{}) error {
+	return fmt.Errorf("(%s) unexpected response format - cannot parse: %v", command, data)
+}
+
+func newConnectionError(command string, err error) error {
+	return fmt.Errorf("(%s) failed to send command through socket: %v", command, err)
+}
+
+func trimSpaceForAll(slice []string) []string {
+	for i := range slice {
+		slice[i] = strings.TrimSpace(slice[i])
+	}
+	return slice
+}

src/socket/protocol.go

@@ -0,0 +1,69 @@
+package socket
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"github.com/nlpodyssey/gopickle/pickle"
+)
+
+const (
+	commandTerminator    = "<F2B_END_COMMAND>"
+	pingCommand          = "ping"
+	statusCommand        = "status"
+	versionCommand       = "version"
+	banTimeCommandFmt    = "get %s bantime"
+	findTimeCommandFmt   = "get %s findtime"
+	maxRetriesCommandFmt = "get %s maxretry"
+	socketReadBufferSize = 1024
+)
+
+func (s *Fail2BanSocket) sendCommand(command []string) (interface{}, error) {
+	err := s.write(command)
+	if err != nil {
+		return nil, err
+	}
+	return s.read()
+}
+
+func (s *Fail2BanSocket) write(command []string) error {
+	err := s.encoder.Encode(command)
+	if err != nil {
+		return err
+	}
+	_, err = s.socket.Write([]byte(commandTerminator))
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (s *Fail2BanSocket) read() (interface{}, error) {
+	reader := bufio.NewReader(s.socket)
+
+	data := []byte{}
+	for {
+		buf := make([]byte, socketReadBufferSize)
+		_, err := reader.Read(buf)
+		if err != nil {
+			return nil, err
+		}
+		data = append(data, buf...)
+		containsTerminator := bytes.Contains(data, []byte(commandTerminator))
+		if containsTerminator {
+			break
+		}
+	}
+
+	bufReader := bytes.NewReader(data)
+	unpickler := pickle.NewUnpickler(bufReader)
+
+	unpickler.FindClass = func(module, name string) (interface{}, error) {
+		if module == "builtins" && name == "str" {
+			return &Py_builtins_str{}, nil
+		}
+		return nil, fmt.Errorf("class not found: " + module + " : " + name)
+	}
+
+	return unpickler.Load()
+}

tools/chglog/CHANGELOG.tpl.md

@@ -0,0 +1,60 @@
+# CHANGELOG
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog], and this project adheres to [Semantic Versioning].
+
+{{ if .Versions -}}
+## [Unreleased]
+{{- if .Unreleased.CommitGroups }}
+{{ template "commits" .Unreleased.CommitGroups }}
+{{- end -}}
+
+{{- if .Unreleased.NoteGroups -}}
+{{ template "notes" .Unreleased.NoteGroups }}
+{{- end -}}
+{{- end -}}
+
+{{ range .Versions -}}
+## {{ if .Tag.Previous }}[{{ .Tag.Name }}]{{ else }}{{ .Tag.Name }}{{ end }} - {{ datetime "2006-01-02" .Tag.Date }}
+{{ template "commits" .CommitGroups }}
+{{- if .NoteGroups -}}
+{{ template "notes" .NoteGroups }}
+{{- end -}}
+{{ end }}
+---
+
+*This changelog is automatically generated by [git-chglog]*
+
+[Keep a Changelog]: https://keepachangelog.com/en/1.0.0/
+[Semantic Versioning]: https://semver.org/spec/v2.0.0.html
+[git-chglog]: https://github.com/git-chglog/git-chglog
+
+{{- if .Versions }}
+[Unreleased]: {{ .Info.RepositoryURL }}/compare/{{ $latest := index .Versions 0 }}{{ $latest.Tag.Name }}...main
+{{ range .Versions -}}
+{{ if .Tag.Previous -}}
+[{{ .Tag.Name }}]: {{ $.Info.RepositoryURL }}/compare/{{ .Tag.Previous.Name }}...{{ .Tag.Name }}
+{{ end -}}
+{{ end -}}
+{{ end -}}
+
+{{- define "notes" }}
+{{- range . -}}
+### {{ .Title }}
+{{ range .Notes -}}
+- {{ .Body }}
+{{ end }}
+{{ end }}
+{{ end -}}
+
+{{- define "commits" }}
+{{- range . -}}
+{{ if or (eq .RawTitle "feat") (eq .RawTitle "fix") }}
+### {{ .Title }}
+{{ range .Commits -}}
+- ({{ .Hash.Short }}) {{ if .Scope }}**{{ .Scope }}:** {{ end }}{{ .Header }}
+{{ end }}
+{{ end -}}
+{{ end -}}
+{{ end -}}

tools/chglog/config.yml

@@ -0,0 +1,23 @@
+style: gitlab
+template: CHANGELOG.tpl.md
+info:
+  title: CHANGELOG
+  repository_url: https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter
+options:
+  commit_groups:
+    title_maps:
+      feat: Added
+      fix: Fixed
+      revert: Reverted
+  header:
+    pattern: "^(\\w*)\\:\\s(.*)$"
+    pattern_maps:
+      - Type
+      - Subject
+  notes:
+    keywords:
+      - BREAKING CHANGE
+      - Changed
+      - Deprecated
+      - Removed
+      - Security