release: 3.6.1

- https://github.com/rhysd/actionlint is cool

.github/actionlint-matcher.json

@@ -0,0 +1,17 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "actionlint",
+      "pattern": [
+        {
+          "regexp": "^(?:\\x1b\\[\\d+m)?(.+?)(?:\\x1b\\[\\d+m)*:(?:\\x1b\\[\\d+m)*(\\d+)(?:\\x1b\\[\\d+m)*:(?:\\x1b\\[\\d+m)*(\\d+)(?:\\x1b\\[\\d+m)*: (?:\\x1b\\[\\d+m)*(.+?)(?:\\x1b\\[\\d+m)* \\[(.+?)\\]$",
+          "file": 1,
+          "line": 2,
+          "column": 3,
+          "message": 4,
+          "code": 5
+        }
+      ]
+    }
+  ]
+}

.github/renovate.json5

@@ -0,0 +1,41 @@
+{
+  extends: [
+    "config:base",
+    ":dependencyDashboard",
+    ":prHourlyLimitNone",
+    ":prConcurrentLimitNone",
+    ":label(dependency-upgrade)",
+  ],
+  schedule: ["before 8am on thursday"],
+  branchPrefix: "renovate-",
+  dependencyDashboardHeader: "View repository job log [here](https://app.renovatebot.com/dashboard#github/cmur2/dyndnsd).",
+  separateMinorPatch: true,
+  commitMessagePrefix: "project: ",
+  commitMessageAction: "update",
+  commitMessageTopic: "{{depName}}",
+  commitMessageExtra: "to {{#if isSingleVersion}}v{{{newVersion}}}{{else}}{{{newValue}}}{{/if}}",
+  packageRules: [
+    // Ruby dependencies are managed by depfu
+    {
+      matchManagers: ["bundler"],
+      enabled: false,
+    },
+    // Commit message formats
+    {
+      matchDatasources: ["docker"],
+      commitMessagePrefix: "docker: ",
+    },
+    {
+      matchManagers: ["github-actions"],
+      commitMessagePrefix: "ci: ",
+    },
+  ],
+  regexManagers: [
+    {
+      fileMatch: ["\.rb$", "^Rakefile$"],
+      matchStrings: [
+        "renovate: datasource=(?<datasource>.*?) depName=(?<depName>.*?)\\s.*_version = '(?<currentValue>.*)'\\s"
+      ]
+    },
+  ],
+}

.github/workflows/cd.yml

@@ -1,3 +1,4 @@
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
 ---
 name: cd
 
@@ -10,17 +11,41 @@ jobs:
   release-dockerimage:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
+
     - name: Extract dyndnsd version from tag name
       run: |
-        echo ::set-env name=DYNDNSD_VERSION::${GITHUB_REF#refs/*/v}
+        echo "DYNDNSD_VERSION=${GITHUB_REF#refs/*/v}" >> "$GITHUB_ENV"
+
+    - name: Wait for dyndnsd ${{ env.DYNDNSD_VERSION }} gem to be available
+      run: |
+        set +e
+        for retry in $(seq 1 5); do
+          echo "Checking if dyndnsd $DYNDNSD_VERSION gem is retrievable from rubygems.org (try #$retry)..."
+          sudo gem install dyndnsd -v "$DYNDNSD_VERSION"
+          # shellcheck disable=SC2181
+          if [ $? -eq 0 ]; then
+            exit 0
+          fi
+          sleep 60
+        done
+        exit 1
+
     # https://github.com/marketplace/actions/build-and-push-docker-images
-    - name: Build and push Docker image for dyndnsd ${{ env.DYNDNSD_VERSION }}
+    - name: Set up Docker Buildx
-      uses: docker/build-push-action@v1
+      uses: docker/setup-buildx-action@v2
+
+    - name: Login to Docker Hub
+      uses: docker/login-action@v2
       with:
         username: cmur2
         password: ${{ secrets.DOCKER_TOKEN }}
-        repository: cmur2/dyndnsd
+
-        path: docker
+    - name: Build and push Docker image for dyndnsd ${{ env.DYNDNSD_VERSION }}
-        build_args: DYNDNSD_VERSION=${{ env.DYNDNSD_VERSION }}
+      uses: docker/build-push-action@v3
-        tag_with_ref: true
+      with:
+        context: docker
+        build-args: |
+          DYNDNSD_VERSION=${{ env.DYNDNSD_VERSION }}
+        push: true
+        tags: cmur2/dyndnsd:v${{ env.DYNDNSD_VERSION }}

.github/workflows/ci.yml

@@ -0,0 +1,43 @@
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
+---
+name: ci
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+  workflow_dispatch:
+  schedule:
+  - cron: '35 4 * * 4'  # weekly on thursday morning
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby-version:
+        - '2.7'
+        - '3.0'
+        - '3.1'
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Ruby ${{ matrix.ruby-version }}
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby-version }}
+        bundler-cache: true  # runs 'bundle install' and caches installed gems automatically
+
+    - name: Lint and Test
+      run: |
+        bundle exec rake ci
+
+  actionlint:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: Check workflow files
+      run: |
+        echo "::add-matcher::.github/actionlint-matcher.json"
+        bash <(curl https://raw.githubusercontent.com/rhysd/actionlint/main/scripts/download-actionlint.bash)
+        ./actionlint

.github/workflows/dockerhub.yml

@@ -0,0 +1,20 @@
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
+---
+name: dockerhub
+
+on:
+  schedule:
+  - cron: '7 4 * * 4'  # weekly on thursday morning
+  workflow_dispatch:
+
+jobs:
+  pull-released-dockerimages:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Avoid stale tags by pulling
+      run: |
+        ALL_IMAGES="$(curl -s https://hub.docker.com/v2/repositories/cmur2/dyndnsd/tags?page_size=1000 | jq -r '.results[].name | "cmur2/dyndnsd:" + .' | grep -e 'cmur2/dyndnsd:v')"
+        for image in $ALL_IMAGES; do
+          echo "Pulling $image to avoid staleness..."
+          docker pull "$image"
+        done

.github/workflows/vulnscan.yml

@@ -1,3 +1,4 @@
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
 ---
 name: vulnscan
 
@@ -10,21 +11,20 @@ jobs:
   scan-released-dockerimages:
     runs-on: ubuntu-latest
     env:
-      TRIVY_LIGHT: 'true'
       TRIVY_IGNORE_UNFIXED: 'true'
       TRIVY_REMOVED_PKGS: 'true'
     steps:
     - name: Install Trivy
       run: |
-        mkdir -p $GITHUB_WORKSPACE/bin
+        mkdir -p "$GITHUB_WORKSPACE/bin"
-        echo "::add-path::$GITHUB_WORKSPACE/bin"
+        echo "$GITHUB_WORKSPACE/bin" >> "$GITHUB_PATH"
-        curl -sfL https://raw.githubusercontent.com/aquasecurity/trivy/master/contrib/install.sh | sh -s -- -b $GITHUB_WORKSPACE/bin
+        curl -sfL https://raw.githubusercontent.com/aquasecurity/trivy/master/contrib/install.sh | sh -s -- -b "$GITHUB_WORKSPACE/bin"
     - name: Download Trivy DB
       run: |
         trivy image --download-db-only
     - name: Scan vulnerabilities using Trivy
       env:
-        TRIVY_SKIP_DIRS: '/usr/lib/ruby/gems/2.7.0/gems/jaeger-client-0.10.0/crossdock,/usr/lib/ruby/gems/2.7.0/gems/jaeger-client-1.0.0/crossdock'
+        TRIVY_SKIP_DIRS: 'usr/lib/ruby/gems/2.7.0/gems/jaeger-client-0.10.0/crossdock,usr/lib/ruby/gems/2.7.0/gems/jaeger-client-1.0.0/crossdock,usr/lib/ruby/gems/2.7.0/gems/jaeger-client-1.1.0/crossdock'
       run: |
         trivy --version
 

.gitignore

@@ -2,3 +2,5 @@
 *.lock
 pkg/*
 .yardoc
+hadolint
+trivy

.rubocop.yml

@@ -1,7 +1,14 @@
+require:
+- rubocop-rake
+- rubocop-rspec
+
 AllCops:
-  TargetRubyVersion: '2.5'
+  TargetRubyVersion: '2.7'
   NewCops: enable
 
+Gemspec/RequireMFA:
+  Enabled: false
+
 Layout/EmptyLineAfterGuardClause:
   Enabled: false
 
@@ -86,3 +93,9 @@ Style/SymbolArray:
 
 Style/TrailingCommaInArrayLiteral:
   Enabled: false
+
+RSpec/ExampleLength:
+  Max: 20
+
+RSpec/MultipleExpectations:
+  Max: 20

.travis.yml

@@ -1,13 +0,0 @@
----
-os: linux
-language: ruby
-rvm:
-- 2.7
-- 2.6
-- 2.5
-
-services:
-- docker
-
-script:
-- bundle exec rake travis

CHANGELOG.md

@@ -1,6 +1,152 @@
 # Changelog
 
-## 3.1.1 (october 3, 2020)
+## 3.6.1 (July 21st, 2022)
+
+OTHER:
+
+- update base of Docker image to Alpine 3.16.1 (from 3.16.0 before)
+
+## 3.6.0 (June 2nd, 2022)
+
+IMPROVEMENTS:
+
+- Drop EOL Ruby 2.6 and lower support, now minimum version supported is Ruby 2.7
+
+OTHER:
+
+- update base of Docker image to Alpine 3.16 (from 3.15.7 before)
+
+## 3.5.3 (May 5th, 2022)
+
+OTHER:
+
+- re-release 3.5.2 to rebuild Docker image with security vulnerabilities fixes
+
+## 3.5.2 (April 7th, 2022)
+
+OTHER:
+
+- re-release 3.5.1 to rebuild Docker image with security vulnerabilities fixes
+
+## 3.5.1 (February 17th, 2022)
+
+OTHER:
+
+- re-release 3.5.0 to rebuild Docker image with security vulnerabilities fixes
+
+## 3.5.0 (January 8th, 2022)
+
+IMPROVEMENTS:
+
+- add Ruby 3.1 support
+
+OTHER:
+
+- update base of Docker image to Alpine 3.15 (from 3.13.7 before, **Note:** please be aware of the quirks around [Alpine 3.14](https://wiki.alpinelinux.org/wiki/Release_Notes_for_Alpine_3.14.0#faccessat2))
+
+## 3.4.8 (December 11th, 2021)
+
+OTHER:
+
+- re-release 3.4.7 to rebuild Docker image with security vulnerabilities fixes
+
+## 3.4.7 (November 19th, 2021)
+
+OTHER:
+
+- re-release 3.4.6 to rebuild Docker image with security vulnerabilities fixes
+
+## 3.4.6 (November 19th, 2021)
+
+OTHER:
+
+- re-release 3.4.5 to rebuild Docker image with security vulnerabilities fixes
+
+## 3.4.5 (August 26th, 2021)
+
+OTHER:
+
+- re-release 3.4.4 to rebuild Docker image with security vulnerabilities fixes
+
+## 3.4.4 (August 26th, 2021)
+
+OTHER:
+
+- re-release 3.4.3 to rebuild Docker image with security vulnerabilities fixes
+
+## 3.4.3 (August 20th, 2021)
+
+OTHER:
+
+- re-release 3.4.2 to rebuild Docker image with security vulnerabilities fixes
+
+## 3.4.2 (July 30, 2021)
+
+IMPROVEMENTS:
+
+- move from OpenTracing to OpenTelemetry for experimental tracing feature
+
+OTHER:
+
+- re-release 3.4.1 to rebuild Docker image with security vulnerabilities fixes
+- adopt Renovate for dependency updates
+
+## 3.4.1 (April 15, 2021)
+
+OTHER:
+
+- update base of Docker image to Alpine 3.13.5 to fix security vulnerabilities
+
+## 3.4.0 (April 2, 2021)
+
+IMPROVEMENTS:
+
+- **change** Docker image to run as non-root user `65534` by default, limits attack surface for security and gives OpenShift compatibility
+
+## 3.3.3 (April 1, 2021)
+
+OTHER:
+
+- update base of Docker image to Alpine 3.13.4 to fix security vulnerabilities
+
+## 3.3.2 (February 20, 2021)
+
+OTHER:
+
+- update to use `docker/build-push-action@v2` for releasing Docker image in GHA
+
+## 3.3.1 (February 18, 2021)
+
+OTHER:
+
+- update base of Docker image to Alpine 3.13.2 to fix security vulnerabilities
+
+## 3.3.0 (January 18, 2021)
+
+OTHER:
+
+- update base of Docker image to Alpine 3.13
+
+## 3.2.0 (January 14, 2021)
+
+IMPROVEMENTS:
+
+- Add Ruby 3.0 support
+
+## 3.1.3 (December 20, 2020)
+
+OTHER:
+
+- fix Docker image release process in Github Actions CI, 3.1.2 was not released as a Docker image
+
+## 3.1.2 (December 20, 2020)
+
+OTHER:
+
+- fixes vulnerabilities in Docker image by using updated Alpine base image
+- start using Github Actions CI for tests and drop Travis CI
+
+## 3.1.1 (October 3, 2020)
 
 IMPROVEMENTS:
 
@@ -120,7 +266,7 @@ IMPROVEMENTS:
 
 IMPROVEMENTS:
 
-- Support dropping priviliges on startup, also affects external commands run
+- Support dropping privileges on startup, also affects external commands run
 - Add [metriks](https://github.com/eric/metriks) support for basic metrics in the process title
 - Detach from child processes running external commands to avoid zombie processes
 

README.md

@@ -1,6 +1,6 @@
 # dyndnsd.rb
 
-[![Build Status](https://travis-ci.org/cmur2/dyndnsd.svg?branch=master)](https://travis-ci.org/cmur2/dyndnsd) [![Dependencies](https://badges.depfu.com/badges/4f25da8493f7a29f652ac892fbf9227b/overview.svg)](https://depfu.com/github/cmur2/dyndnsd)
+![ci](https://github.com/cmur2/dyndnsd/workflows/ci/badge.svg) [![Dependencies](https://badges.depfu.com/badges/4f25da8493f7a29f652ac892fbf9227b/overview.svg)](https://depfu.com/github/cmur2/dyndnsd)
 
 A small, lightweight and extensible DynDNS server written with Ruby and Rack.
 
@@ -75,7 +75,7 @@ There is an officially maintained [Docker image for dyndnsd](https://hub.docker.
 
 Users can make extensions by deriving from the official Docker image or building their own.
 
-The Docker image consumes the same configuration file in YAML format as the gem, inside the container it needs to be mounted/available as `/etc/dyndnsd/config.yml`. the following YAML should be used as a base and extended with user's settings:
+The Docker image consumes the same configuration file in YAML format as the gem, inside the container it needs to be mounted/available as `/etc/dyndnsd/config.yml`. The following YAML should be used as a base and extended with user's settings:
 
 ```yaml
 host: "0.0.0.0"
@@ -98,7 +98,7 @@ docker run -d --name dyndnsd \
            cmur2/dyndnsd:vX.Y.Z
 ```
 
-*Note*: You may need to expose more then just port 8080 e.g. if you use the `zone_transfer_server` which can be done by appending additional `-p 5353:5353` flags to the `docker run` command.
+*Note*: You may need to expose more than just port 8080 e.g. if you use the `zone_transfer_server` which can be done by appending additional `-p 5353:5353` flags to the `docker run` command.
 
 
 
@@ -106,7 +106,7 @@ docker run -d --name dyndnsd \
 
 By using [DNS zone transfers via AXFR (RFC5936)](https://tools.ietf.org/html/rfc5936) any secondary nameserver can retrieve the DNS zone contents from dyndnsd.rb and serve them to clients.
 To speedup propagation after changes dyndnsd.rb can issue a [DNS NOTIFY (RFC1996)](https://tools.ietf.org/html/rfc1996) to inform the nameserver that the DNS zone contents changed and should be fetched even before the time indicated in the SOA record is up.
-Currently dyndnsd.rb does not support any authentication for incoming DNS zone transfer requests so it should be isolated from the internet on these ports.
+Currently, dyndnsd.rb does not support any authentication for incoming DNS zone transfer request, so it should be isolated from the internet on these ports.
 
 This approach has several advantages:
 - dyndnsd.rb can be used in *hidden primary* fashion isolated from client's DNS traffic and does not need to implement full nameserver features
@@ -151,7 +151,7 @@ users:
 
 NSD is a nice, open source, authoritative-only, low-memory DNS server that reads BIND-style zone files (and converts them into its own database) and has a simple configuration file.
 
-A feature NSD is lacking is the [Dynamic DNS update (RFC2136)](https://tools.ietf.org/html/rfc2136) functionality BIND offers but one can fake it using the following dyndnsd.rb configuration:
+A feature NSD is lacking is the [Dynamic DNS update (RFC2136)](https://tools.ietf.org/html/rfc2136) functionality BIND offers, but one can fake it using the following dyndnsd.rb configuration:
 
 ```yaml
 host: "0.0.0.0"
@@ -198,23 +198,23 @@ The update URL you want to tell your clients (humans or scripts ^^) consists of
 where:
 
 * the protocol depends on your (web server/proxy) settings
-* USER and PASSWORD are needed for HTTP Basic Auth and valid combinations are defined in your config.yaml
+* `USER` and `PASSWORD` are needed for HTTP Basic Auth and valid combinations are defined in your config.yaml
-* DOMAIN should match what you defined in your config.yaml as domain but may be anything else when using a webserver as proxy
+* `DOMAIN` should match what you defined in your config.yaml as domain but may be anything else when using a web server as proxy
-* PORT depends on your (webserver/proxy) settings
+* `PORT` depends on your (web server/proxy) settings
-* HOSTNAMES is a required list of comma-separated FQDNs (they all have to end with your config.yaml domain) the user wants to update
+* `HOSTNAMES` is a required list of comma-separated FQDNs (they all have to end with your config.yaml domain) the user wants to update
-* MYIP is optional and the HTTP client's IP address will be used if missing
+* `MYIP` is optional and the HTTP client's IP address will be used if missing
-* MYIP6 is optional but if present also requires presence of MYIP
+* `MYIP6` is optional but if present also requires presence of `MYIP`
 
 
 ### IP address determination
 
 The following rules apply:
 
-* use any IP address provided via the myip parameter when present, or
+* use any IP address provided via the `myip` parameter when present, or
-* use any IP address provided via the X-Real-IP header e.g. when used behind HTTP reverse proxy such as nginx, or
+* use any IP address provided via the `X-Real-IP` header e.g. when used behind HTTP reverse proxy such as nginx, or
 * use any IP address used by the connecting HTTP client
 
-If you want to provide an additional IPv6 address as myip6 parameter, the myip parameter containing an IPv4 address has to be present, too! No automatism is applied then.
+If you want to provide an additional IPv6 address as myip6 parameter, the `myip` parameter containing an IPv4 address has to be present, too! No automatism is applied then.
 
 
 ### SSL, multiple listen ports
@@ -231,7 +231,7 @@ The [Debian 6 init.d script](docs/debian-6-init-dyndnsd) assumes that dyndnsd.rb
 
 ### Monitoring
 
-For monitoring dyndnsd.rb uses the [metriks](https://github.com/eric/metriks) framework and exposes several metrics like the number of unauthenticated requests, requests that did (not) update a hostname, etc. By default the most important metrics are shown in the [proctitle](https://github.com/eric/metriks#proc-title-reporter) but you can also configure a [Graphite](https://graphiteapp.org/) backend for central monitoring or the [textfile_reporter](https://github.com/prometheus/node_exporter/#textfile-collector) which outputs Graphite-style metrics that are also compatible with Prometheus to a file.
+For monitoring dyndnsd.rb uses the [metriks](https://github.com/eric/metriks) framework and exposes several metrics like the number of unauthenticated requests, requests that did (not) update a hostname, etc. By default, the most important metrics are shown in the [proctitle](https://github.com/eric/metriks#proc-title-reporter, butt you can also configure a [Graphite](https://graphiteapp.org/) backend for central monitoring or the [textfile_reporter](https://github.com/prometheus/node_exporter/#textfile-collector) which outputs Graphite-style metrics that are also compatible with Prometheus to a file.
 
 ```yaml
 host: "0.0.0.0"
@@ -271,9 +271,9 @@ users:
 
 ### Tracing (experimental)
 
-For tracing, dyndnsd.rb is instrumented using the [OpenTracing](http://opentracing.io/) framework and will emit span tracing data for the most important operations happening during the request/response cycle. Using a middleware for Rack allows handling incoming OpenTracing span information properly.
+For tracing, dyndnsd.rb is instrumented using the [OpenTelemetry](https://opentelemetry.io/docs/ruby/) framework and will emit span tracing data for the most important operations happening during the request/response cycle. Using an [instrumentation for Rack](https://github.com/open-telemetry/opentelemetry-ruby/tree/main/instrumentation/rack) allows handling incoming OpenTelemetry parent span information properly (when desired, turned off by default to reduce attack surface).
 
-Currently only one OpenTracing-compatible tracer implementation named [CNCF Jaeger](https://github.com/jaegertracing/jaeger) can be configured to use with dyndnsd.rb.
+Currently, the [OpenTelemetry trace exporter](https://github.com/open-telemetry/opentelemetry-ruby/tree/main/exporter/jaeger) for [CNCF Jaeger](https://github.com/jaegertracing/jaeger) can be enabled via dyndnsd.rb configuration. Alternatively, you can also enable other exporters via the environment variable `OTEL_TRACES_EXPORTER`, e.g. `OTEL_TRACES_EXPORTER=console`.
 
 ```yaml
 host: "0.0.0.0"
@@ -282,11 +282,9 @@ db: "/opt/dyndnsd/db.json"
 domain: "dyn.example.org"
 # enable and configure tracing using the (currently only) tracer jaeger
 tracing:
-  trust_incoming_span: false # default value, change to accept incoming OpenTracing spans as parents
+  trust_incoming_span: false # default value, change to accept incoming OpenTelemetry spans as parents
-  jaeger:
+  service_name: "my.dyndnsd.identifier" # default unset, will be populated by OpenTelemetry
-    host: 127.0.0.1 # defaults for host and port of local jaeger-agent
+  jaeger: true # enables the Jaeger AgentExporter
-    port: 6831
-    service_name: "my.dyndnsd.identifier"
 # configure the updater, here we use command_with_bind_zone, params are updater-specific
 updater:
   name: "command_with_bind_zone"

Rakefile

@@ -21,11 +21,61 @@ namespace :solargraph do
   end
 end
 
-desc 'Run hadolint for Dockerfile linting'
+# renovate: datasource=github-tags depName=hadolint/hadolint
-task :hadolint do
+hadolint_version = 'v2.10.0'
-  sh 'docker run --rm -i hadolint/hadolint:v1.18.0 hadolint --ignore DL3018 - < docker/Dockerfile'
+
+# renovate: datasource=github-tags depName=aquasecurity/trivy
+trivy_version = 'v0.30.1'
+
+namespace :docker do
+  ci_image = 'cmur2/dyndnsd:ci'
+
+  desc 'Lint Dockerfile'
+  task :lint do
+    sh "if [ ! -e ./hadolint ]; then wget -q -O ./hadolint https://github.com/hadolint/hadolint/releases/download/#{hadolint_version}/hadolint-Linux-x86_64; fi"
+    sh 'chmod a+x ./hadolint'
+    sh './hadolint --ignore DL3018 docker/Dockerfile'
+    sh './hadolint --ignore DL3018 --ignore DL3028 docker/ci/Dockerfile'
+  end
+
+  desc 'Build CI Docker image'
+  task :build do
+    sh 'docker build -t cmur2/dyndnsd:ci -f docker/ci/Dockerfile .'
+  end
+
+  desc 'Scan CI Docker image for vulnerabilities'
+  task :scan do
+    ver = trivy_version.gsub('v', '')
+    sh "if [ ! -e ./trivy ]; then wget -q -O - https://github.com/aquasecurity/trivy/releases/download/v#{ver}/trivy_#{ver}_Linux-64bit.tar.gz | tar -xzf - trivy; fi"
+    sh "./trivy image #{ci_image}"
+  end
+
+  desc 'End-to-end test the CI Docker image'
+  task :e2e do
+    sh <<~SCRIPT
+      echo -n '{}' > e2e/db.json
+      chmod a+w e2e/db.json
+    SCRIPT
+    sh "docker run -d --name=dyndnsd-ci -v $(pwd)/e2e:/etc/dyndnsd -p 8080:8080 -p 5353:5353 #{ci_image}"
+    sh 'sleep 1'
+    puts '----------------------------------------'
+    # `dig` needs `sudo apt-get install -y -q dnsutils`
+    sh <<~SCRIPT
+      curl -s -o /dev/null -w '%{http_code}' 'http://localhost:8080/' | grep -q '401'
+      curl -s 'http://foo:secret@localhost:8080/nic/update?hostname=foo.dyn.example.org&myip=1.2.3.4' | grep -q 'good'
+      curl -s 'http://foo:secret@localhost:8080/nic/update?hostname=foo.dyn.example.org&myip=1.2.3.4' | grep -q 'nochg'
+      dig +short AXFR 'dyn.example.org' @127.0.0.1 -p 5353 | grep -q '1.2.3.4'
+    SCRIPT
+    puts '----------------------------------------'
+    sh <<~SCRIPT
+      docker logs dyndnsd-ci
+      docker container rm -f -v dyndnsd-ci
+      rm e2e/db.json
+    SCRIPT
+  end
 end
 
 task default: [:rubocop, :spec, 'bundle:audit', :solargraph]
 
-task travis: ['solargraph:init', :default, :hadolint]
+desc 'Run all tasks desired for CI'
+task ci: ['solargraph:init', :default, 'docker:lint', :build, 'docker:build', 'docker:e2e']

docker/Dockerfile

@@ -1,15 +1,22 @@
-FROM alpine:3.12
+FROM alpine:3.16.1
 
 EXPOSE 5353 8080
 
-ARG DYNDNSD_VERSION=3.0.0
+ARG DYNDNSD_VERSION
 
 RUN apk --no-cache add openssl ca-certificates && \
     apk --no-cache add ruby ruby-etc ruby-io-console ruby-json ruby-webrick && \
-    apk --no-cache add --virtual .build-deps ruby-dev build-base tzdata && \
+    apk --no-cache add --virtual .build-deps linux-headers ruby-dev build-base tzdata && \
     gem install --no-document dyndnsd -v ${DYNDNSD_VERSION} && \
+    rm -rf /usr/lib/ruby/gems/*/cache/ && \
     # set timezone to Berlin
     cp /usr/share/zoneinfo/Europe/Berlin /etc/localtime && \
     apk del .build-deps
 
+# Follow the principle of least privilege: run as unprivileged user.
+# Running as non-root enables running this image in platforms like OpenShift
+# that do not allow images running as root.
+# User ID 65534 is usually user 'nobody'.
+USER 65534
+
 ENTRYPOINT ["dyndnsd", "/etc/dyndnsd/config.yml"]

docker/ci/Dockerfile

@@ -0,0 +1,22 @@
+FROM alpine:3.16.1
+
+EXPOSE 5353 8080
+
+COPY pkg/dyndnsd-*.gem /tmp/dyndnsd.gem
+
+RUN apk --no-cache add openssl ca-certificates && \
+    apk --no-cache add ruby ruby-etc ruby-io-console ruby-json ruby-webrick && \
+    apk --no-cache add --virtual .build-deps linux-headers ruby-dev build-base tzdata && \
+    gem install --no-document /tmp/dyndnsd.gem && \
+    rm -rf /usr/lib/ruby/gems/*/cache/ && \
+    # set timezone to Berlin
+    cp /usr/share/zoneinfo/Europe/Berlin /etc/localtime && \
+    apk del .build-deps
+
+# Follow the principle of least privilege: run as unprivileged user.
+# Running as non-root enables running this image in platforms like OpenShift
+# that do not allow images running as root.
+# User ID 65534 is usually user 'nobody'.
+USER 65534
+
+ENTRYPOINT ["dyndnsd", "/etc/dyndnsd/config.yml"]

dyndnsd.gemspec

@@ -25,21 +25,24 @@ Gem::Specification.new do |s|
   s.executables = ['dyndnsd']
   s.extra_rdoc_files = Dir['README.md', 'CHANGELOG.md', 'LICENSE']
 
-  s.required_ruby_version = '>= 2.5'
+  s.required_ruby_version = '>= 2.7'
 
-  s.add_runtime_dependency 'async-dns', '~> 1.2.0'
+  s.add_runtime_dependency 'async', '~> 1.30.0'
-  s.add_runtime_dependency 'jaeger-client', '~> 1.1.0'
+  s.add_runtime_dependency 'async-dns', '~> 1.3.0'
   s.add_runtime_dependency 'metriks'
-  s.add_runtime_dependency 'opentracing', '~> 0.5.0'
+  s.add_runtime_dependency 'opentelemetry-exporter-jaeger', '~> 0.21.0'
+  s.add_runtime_dependency 'opentelemetry-instrumentation-rack', '~> 0.20.0'
+  s.add_runtime_dependency 'opentelemetry-sdk', '~> 1.0.0.rc2'
   s.add_runtime_dependency 'rack', '~> 2.0'
-  s.add_runtime_dependency 'rack-tracer', '~> 0.9.0'
   s.add_runtime_dependency 'webrick', '>= 1.6.1'
 
   s.add_development_dependency 'bundler'
-  s.add_development_dependency 'bundler-audit', '~> 0.7.0'
+  s.add_development_dependency 'bundler-audit', '~> 0.9.0'
   s.add_development_dependency 'rack-test'
   s.add_development_dependency 'rake'
   s.add_development_dependency 'rspec'
-  s.add_development_dependency 'rubocop', '~> 0.92.0'
+  s.add_development_dependency 'rubocop', '~> 1.31.0'
-  s.add_development_dependency 'solargraph'
+  s.add_development_dependency 'rubocop-rake', '~> 0.6.0'
+  s.add_development_dependency 'rubocop-rspec', '~> 2.12.0'
+  s.add_development_dependency 'solargraph', '~> 0.45.0'
 end

e2e/config.yml

@@ -0,0 +1,31 @@
+---
+host: "0.0.0.0"
+port: 8080
+
+db: /etc/dyndnsd/db.json
+debug: false
+domain: dyn.example.org
+#responder: RestStyle
+
+updater:
+  name: zone_transfer_server
+  params:
+    server_listens:
+    - 0.0.0.0@5353
+    #send_notifies:
+    #- 10.0.2.15@53
+    zone_ttl: 300  # 5m
+    zone_nameservers:
+    - dns1.example.org.
+    - dns2.example.org.
+    zone_email_address: admin.example.org.
+    zone_additional_ips:
+    - "127.0.0.1"
+    - "::1"
+
+users:
+  foo:
+    password: "secret"
+    hosts:
+    - foo.dyn.example.org
+    - bar.dyn.example.org

lib/dyndnsd.rb

@@ -8,9 +8,9 @@ require 'json'
 require 'yaml'
 require 'rack'
 require 'metriks'
+require 'opentelemetry/instrumentation/rack'
+require 'opentelemetry/sdk'
 require 'metriks/reporter/graphite'
-require 'opentracing'
-require 'rack/tracer'
 
 require 'dyndnsd/generator/bind'
 require 'dyndnsd/updater/command_with_bind_zone'
@@ -69,7 +69,7 @@ module Dyndnsd
     # @return [Boolean]
     def authorized?(username, password)
       Helper.span('check_authorized') do |span|
-        span.set_tag('dyndnsd.user', username)
+        span.set_attribute('enduser.id', username)
 
         allow = Helper.user_allowed?(username, password, @users)
         if !allow
@@ -106,13 +106,13 @@ module Dyndnsd
       puts "DynDNSd version #{Dyndnsd::VERSION}"
       puts "Using config file #{config_file}"
 
-      config = YAML.safe_load(File.open(config_file, 'r', &:read))
+      config = YAML.safe_load(File.read(config_file))
 
       setup_logger(config)
 
       Dyndnsd.logger.info 'Starting...'
 
-      # drop priviliges as soon as possible
+      # drop privileges as soon as possible
       # NOTE: first change group than user
       if config['group']
         group = Etc.getgrnam(config['group'])
@@ -170,7 +170,7 @@ module Dyndnsd
     def process_changes(hostnames, myips)
       changes = []
       Helper.span('process_changes') do |span|
-        span.set_tag('dyndnsd.hostnames', hostnames.join(','))
+        span.set_attribute('dyndnsd.hostnames', hostnames.join(','))
 
         hostnames.each do |hostname|
           # myips order is always deterministic
@@ -252,6 +252,8 @@ module Dyndnsd
       Dyndnsd.logger.progname = 'dyndnsd'
       Dyndnsd.logger.formatter = LogFormatter.new
       Dyndnsd.logger.level = config['debug'] ? Logger::DEBUG : Logger::INFO
+
+      OpenTelemetry.logger = Dyndnsd.logger
     end
 
     # @return [void]
@@ -296,16 +298,31 @@ module Dyndnsd
     # @param config [Hash{String => Object}]
     # @return [void]
     private_class_method def self.setup_tracing(config)
-      # configure OpenTracing
+      # by default do not try to emit any traces until the user opts in
-      if config.dig('tracing', 'jaeger')
+      ENV['OTEL_TRACES_EXPORTER'] ||= 'none'
-        require 'jaeger/client'
 
-        host = config['tracing']['jaeger']['host'] || '127.0.0.1'
+      # configure OpenTelemetry
-        port = config['tracing']['jaeger']['port'] || 6831
+      OpenTelemetry::SDK.configure do |c|
-        service_name = config['tracing']['jaeger']['service_name'] || 'dyndnsd'
+        if config.dig('tracing', 'jaeger')
-        OpenTracing.global_tracer = Jaeger::Client.build(
+          require 'opentelemetry/exporter/jaeger'
-          host: host, port: port, service_name: service_name, flush_interval: 1
+
+          c.add_span_processor(
+            OpenTelemetry::SDK::Trace::Export::BatchSpanProcessor.new(
+              OpenTelemetry::Exporter::Jaeger::AgentExporter.new
             )
+          )
+        end
+
+        if config.dig('tracing', 'service_name')
+          c.service_name = config['tracing']['service_name']
+        end
+
+        c.service_version = Dyndnsd::VERSION
+        c.use('OpenTelemetry::Instrumentation::Rack')
+      end
+
+      if !config.dig('tracing', 'trust_incoming_span')
+        OpenTelemetry.propagation = OpenTelemetry::Context::Propagation::NoopTextMapPropagator.new
       end
     end
 
@@ -331,8 +348,7 @@ module Dyndnsd
         app = Responder::DynDNSStyle.new(app)
       end
 
-      trust_incoming_span = config.dig('tracing', 'trust_incoming_span') || false
+      app = OpenTelemetry::Instrumentation::Rack::Middlewares::TracerMiddleware.new(app)
-      app = Rack::Tracer.new(app, trust_incoming_span: trust_incoming_span)
 
       Rack::Handler::WEBrick.run app, Host: config['host'], Port: config['port']
     end

lib/dyndnsd/helper.rb

@@ -45,24 +45,17 @@ module Dyndnsd
     # @param block [Proc]
     # @return [void]
     def self.span(operation, &block)
-      scope = OpenTracing.start_active_span(operation)
+      tracer = OpenTelemetry.tracer_provider.tracer(Dyndnsd.name, Dyndnsd::VERSION)
-      span = scope.span
+      tracer.in_span(
-      span.set_tag('component', 'dyndnsd')
+        operation,
-      span.set_tag('span.kind', 'server')
+        attributes: {'component' => 'dyndnsd'},
-      begin
+        kind: :server
+      ) do |span|
+        Dyndnsd.logger.debug "Creating span ID #{span.context.hex_span_id} for trace ID #{span.context.hex_trace_id}"
         block.call(span)
       rescue StandardError => e
-        span.set_tag('error', true)
+        span.record_exception(e)
-        span.log_kv(
+        raise e
-          event: 'error',
-          'error.kind': e.class.to_s,
-          'error.object': e,
-          message: e.message,
-          stack: e.backtrace&.join("\n") || ''
-        )
-        raise
-      ensure
-        scope.close
       end
     end
   end

lib/dyndnsd/textfile_reporter.rb

@@ -18,7 +18,7 @@ module Dyndnsd
 
       @registry  = options[:registry] || Metriks::Registry.default
       @interval  = options[:interval] || 60
-      @on_error  = options[:on_error] || proc { |ex| }
+      @on_error  = options[:on_error] || proc { |ex| } # default: ignore errors
     end
 
     # @return [void]

lib/dyndnsd/updater/command_with_bind_zone.rb

@@ -18,10 +18,10 @@ module Dyndnsd
         return if !db.changed?
 
         Helper.span('updater_update') do |span|
-          span.set_tag('dyndnsd.updater.name', self.class.name&.split('::')&.last || 'None')
+          span.set_attribute('dyndnsd.updater.name', self.class.name&.split('::')&.last || 'None')
 
           # write zone file in bind syntax
-          File.open(@zone_file, 'w') { |f| f.write(@generator.generate(db)) }
+          File.write(@zone_file, @generator.generate(db))
           # call user-defined command
           pid = fork do
             exec @command

lib/dyndnsd/updater/zone_transfer_server.rb

@@ -35,7 +35,7 @@ module Dyndnsd
       # @return [void]
       def update(db)
         Helper.span('updater_update') do |span|
-          span.set_tag('dyndnsd.updater.name', self.class.name&.split('::')&.last || 'None')
+          span.set_attribute('dyndnsd.updater.name', self.class.name&.split('::')&.last || 'None')
 
           soa_rr = Resolv::DNS::Resource::IN::SOA.new(
             @zone_nameservers[0], @zone_email_address,

lib/dyndnsd/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Dyndnsd
-  VERSION = '3.1.1'
+  VERSION = '3.6.1'
 end

spec/dyndnsd/daemon_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require_relative 'spec_helper'
+require_relative '../spec_helper'
 
 describe Dyndnsd::Daemon do
   include Rack::Test::Methods
@@ -24,9 +24,7 @@ describe Dyndnsd::Daemon do
 
     app = Rack::Auth::Basic.new(daemon, 'DynDNS', &daemon.method(:authorized?))
 
-    app = Dyndnsd::Responder::DynDNSStyle.new(app)
+    Dyndnsd::Responder::DynDNSStyle.new(app)
-
-    Rack::Tracer.new(app, trust_incoming_span: false)
   end
 
   it 'requires authentication' do

upgrade-version.sh

@@ -0,0 +1,13 @@
+#!/bin/bash -eux
+
+sed -i "s/$1/$2/g" lib/dyndnsd/version.rb
+
+release_date=$(LC_ALL=en_US.utf8 date +"%B %-d, %Y")
+
+if grep "## $2 (" CHANGELOG.md; then
+    true
+elif grep "## $2" CHANGELOG.md; then
+    sed -i "s/## $2/## $2 ($release_date)/g" CHANGELOG.md
+else
+    echo "## $2 ($release_date)" >> CHANGELOG.md
+fi