docs: add link to newer version

.editorconfig

@@ -1,9 +0,0 @@
-root = true
-
-[*]
-indent_style = space
-indent_size = 2
-end_of_line = lf
-charset = utf-8
-trim_trailing_whitespace = true
-insert_final_newline = true

.github/renovate.json5

@@ -1,40 +0,0 @@
-{
-  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).",
-  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: ",
-    },
-    {
-      matchDatasources: ["github-actions"],
-      commitMessagePrefix: "ci: ",
-    },
-  ],
-  regexManagers: [
-    {
-      fileMatch: ["\.rb$", "^Rakefile$"],
-      matchStrings: [
-        "renovate: datasource=(?<datasource>.*?) depName=(?<depName>.*?)\\s.*_version = '(?<currentValue>.*)'\\s"
-      ]
-    },
-  ],
-}

.github/workflows/cd.yml

@@ -1,49 +0,0 @@
----
-name: cd
-
-on:
-  push:
-    tags:
-    - 'v*.*.*'
-
-jobs:
-  release-dockerimage:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v2
-
-    - name: Extract dyndnsd version from tag name
-      run: |
-        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"
-          if [ $? -eq 0 ]; then
-            exit 0
-          fi
-          sleep 60
-        done
-        exit 1
-
-    # https://github.com/marketplace/actions/build-and-push-docker-images
-    - name: Set up Docker Buildx
-      uses: docker/setup-buildx-action@v1
-
-    - name: Login to Docker Hub
-      uses: docker/login-action@v1
-      with:
-        username: cmur2
-        password: ${{ secrets.DOCKER_TOKEN }}
-
-    - name: Build and push Docker image for dyndnsd ${{ env.DYNDNSD_VERSION }}
-      uses: docker/build-push-action@v2
-      with:
-        context: docker
-        build-args: |
-          DYNDNSD_VERSION=${{ env.DYNDNSD_VERSION }}
-        push: true
-        tags: cmur2/dyndnsd:v${{ env.DYNDNSD_VERSION }}

.github/workflows/ci.yml

@@ -1,43 +0,0 @@
----
-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:
-        - '2.5'
-        - '2.6'
-        - '2.7'
-        - '3.0'
-    steps:
-    - uses: actions/checkout@v2
-    - 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
-
-    # https://github.com/marketplace/actions/build-and-push-docker-images
-    - name: Set up Docker Buildx
-      uses: docker/setup-buildx-action@v1
-
-    - name: Test building Docker image for dyndnsd
-      uses: docker/build-push-action@v2
-      with:
-        context: .
-        file: docker/ci/Dockerfile

.github/workflows/dockerhub.yml

@@ -1,19 +0,0 @@
----
-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

@@ -1,46 +0,0 @@
----
-name: vulnscan
-
-on:
-  schedule:
-  - cron: '7 4 * * 4'  # weekly on thursday morning
-  workflow_dispatch:
-
-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 $GITHUB_WORKSPACE/bin
-        echo "$GITHUB_WORKSPACE/bin" >> "$GITHUB_PATH"
-        curl -sfL https://raw.githubusercontent.com/aquasecurity/trivy/master/contrib/install.sh | sh -s -- -b $GITHUB_WORKSPACE/bin
-    - name: Download Trivy DB
-      run: |
-        trivy image --download-db-only
-    - name: Scan vulnerabilities using Trivy
-      env:
-        TRIVY_SKIP_DIRS: 'usr/lib/ruby/gems/2.7.0/gems/jaeger-client-0.10.0/crossdock,usr/lib/ruby/gems/2.7.0/gems/jaeger-client-1.0.0/crossdock,usr/lib/ruby/gems/2.7.0/gems/jaeger-client-1.1.0/crossdock'
-      run: |
-        trivy --version
-
-        # semver sorting as per https://stackoverflow.com/a/40391207/2148786
-        ALL_IMAGES="$(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' | sed '/-/!{s/$/_/}' | sort -r -V | sed 's/_$//')"
-        EXIT_CODE=0
-        set -e
-        for major_version in $(seq 1 10); do
-          for image in $ALL_IMAGES; do
-            if [[ "$image" = cmur2/dyndnsd:v$major_version.* ]]; then
-              echo -e "\nScanning newest patch release $image of major v$major_version...\n"
-              if ! trivy image --skip-update --exit-code 1 "$image"; then
-                EXIT_CODE=1
-              fi
-              break
-            fi
-          done
-        done
-        exit "$EXIT_CODE"

.rubocop.yml

@@ -1,10 +1,5 @@
-require:
-- rubocop-rake
-- rubocop-rspec
-
 AllCops:
-  TargetRubyVersion: '2.5'
+  TargetRubyVersion: '2.3'
-  NewCops: enable
 
 Layout/EmptyLineAfterGuardClause:
   Enabled: false
@@ -90,9 +85,3 @@ Style/SymbolArray:
 
 Style/TrailingCommaInArrayLiteral:
   Enabled: false
-
-RSpec/ExampleLength:
-  Max: 20
-
-RSpec/MultipleExpectations:
-  Max: 20

.travis.yml

@@ -0,0 +1,12 @@
+---
+os: linux
+language: ruby
+rvm:
+- 2.7
+- 2.6
+- 2.5
+- 2.4
+- 2.3
+
+script:
+- bundle exec rake travis

CHANGELOG.md

@@ -1,107 +1,5 @@
 # Changelog
 
-## 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:
-
-- Use webrick gem which contains fixes against [CVE-2020-25613](https://www.ruby-lang.org/en/news/2020/09/29/http-request-smuggling-cve-2020-25613/)
-
-## 3.1.0 (August 19, 2020)
-
-IMPROVEMENTS:
-
-- Add officially maintained [Docker image for dyndnsd](https://hub.docker.com/r/cmur2/dyndnsd)
-
-## 3.0.0 (July 29, 2020)
-
-IMPROVEMENTS:
-
-- Drop EOL Ruby 2.4 and lower support, now minimum version supported is Ruby 2.5
-
 ## 2.3.1 (July 27, 2020)
 
 IMPROVEMENTS:
@@ -204,7 +102,7 @@ IMPROVEMENTS:
 
 IMPROVEMENTS:
 
-- Support dropping privileges on startup, also affects external commands run
+- Support dropping priviliges 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

@@ -1,9 +1,10 @@
 # dyndnsd.rb
 
-![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)
+[![Build Status](https://travis-ci.org/cmur2/dyndnsd.svg?branch=dyndnsd-2.x)](https://travis-ci.org/cmur2/dyndnsd) [![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.
 
+**Note:** a newer version of dyndnsd.rb is available on [branch master](https://github.com/cmur2/dyndnsd), see also the [changelog](https://github.com/cmur2/dyndnsd/blob/master/CHANGELOG.md).
 
 ## Description
 
@@ -64,49 +65,14 @@ users:
 
 Run dyndnsd.rb by:
 
-```bash
+	dyndnsd /path/to/config.yaml
-dyndnsd /path/to/config.yml
-```
-
-
-### Docker image
-
-There is an officially maintained [Docker image for dyndnsd](https://hub.docker.com/r/cmur2/dyndnsd) available at Dockerhub. The goal is to have a minimal secured image available (currently based on Alpine) that works well for the `zone_transfer_server` updater use case.
-
-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:
-
-```yaml
-host: "0.0.0.0"
-port: 8080
-# omit the logfile: option so logging to STDOUT will happen automatically
-db: "/var/lib/dyndnsd/db.json"
-
-# User's settings for updater and permissions follow here!
-```
-
-more ports might be needed depending on if DNS zone transfer is needed
-
-Run the Docker image exposing the DynDNS-API on host port 8080 via:
-
-```bash
-docker run -d --name dyndnsd \
-           -p 8080:8080 \
-           -v /host/path/to/dyndnsd/config.yml:/etc/dyndnsd/config.yml \
-           -v /host/ptherpath/to/dyndnsd/datadir:/var/lib/dyndnsd \
-           cmur2/dyndnsd:vX.Y.Z
-```
-
-*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.
-
 
 
 ## Using dyndnsd.rb with any nameserver via DNS zone transfers (AXFR)
 
 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 request, so it should be isolated from the internet on these ports.
+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.
 
 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 +117,7 @@ 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"
@@ -197,41 +163,39 @@ The update URL you want to tell your clients (humans or scripts ^^) consists of
 
 where:
 
-* the protocol depends on your (web server/proxy) settings
+* the protocol depends on your (webserver/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 web server as proxy
+* DOMAIN should match what you defined in your config.yaml as domain but may be anything else when using a webserver as proxy
-* `PORT` depends on your (web server/proxy) settings
+* PORT depends on your (webserver/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
 
-Use a web server as a proxy to handle SSL and/or multiple listen addresses and ports. DynDNS.com provides HTTP on port 80 and 8245 and HTTPS on port 443.
+Use a webserver as a proxy to handle SSL and/or multiple listen addresses and ports. DynDNS.com provides HTTP on port 80 and 8245 and HTTPS on port 443.
 
 
-### Startup
+### Init scripts
 
-There is a [Dockerfile](docs/Dockerfile) that can be used to build a Docker image for running dyndnsd.rb.
+The [Debian 6 init.d script](init.d/debian-6-dyndnsd) assumes that dyndnsd.rb is installed into the system ruby (no RVM support) and the config.yaml is at /opt/dyndnsd/config.yaml. Modify to your needs.
-
-The [Debian 6 init.d script](docs/debian-6-init-dyndnsd) assumes that dyndnsd.rb is installed into the system ruby (no RVM support) and the config.yaml is at /opt/dyndnsd/config.yaml. Modify to your needs.
 
 
 ### 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, 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.
+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.
 
 ```yaml
 host: "0.0.0.0"
@@ -271,9 +235,9 @@ users:
 
 ### Tracing (experimental)
 
-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).
+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.
 
-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`.
+Currently only one OpenTracing-compatible tracer implementation named [CNCF Jaeger](https://github.com/jaegertracing/jaeger) can be configured to use with dyndnsd.rb.
 
 ```yaml
 host: "0.0.0.0"
@@ -282,9 +246,11 @@ 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 OpenTelemetry spans as parents
+  trust_incoming_span: false # default value, change to accept incoming OpenTracing spans as parents
-  service_name: "my.dyndnsd.identifier" # default unset, will be populated by OpenTelemetry
+  jaeger:
-  jaeger: true # enables the Jaeger AgentExporter
+    host: 127.0.0.1 # defaults for host and port of local jaeger-agent
+    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

@@ -9,27 +9,16 @@ RSpec::Core::RakeTask.new(:spec)
 RuboCop::RakeTask.new
 Bundler::Audit::Task.new
 
+desc 'Should be run by developer once to prepare initial solargraph usage (fill caches etc.)'
+task :'solargraph:init' do
+  sh 'solargraph download-core'
+end
+
 desc 'Run experimental solargraph type checker'
-task :solargraph do
+task :'solargraph:tc' do
   sh 'solargraph typecheck'
 end
 
-namespace :solargraph do
+task default: [:rubocop, :spec, 'bundle:audit']
-  desc 'Should be run by developer once to prepare initial solargraph usage (fill caches etc.)'
-  task :init do
-    sh 'solargraph download-core'
-  end
-end
 
-# renovate: datasource=github-tags depName=hadolint/hadolint
+task travis: [:default, :'solargraph:tc']
-hadolint_version = 'v2.7.0'
-
-desc 'Run hadolint for Dockerfile linting'
-task :hadolint do
-  sh "docker run --rm -i hadolint/hadolint:#{hadolint_version} hadolint --ignore DL3018 - < docker/Dockerfile"
-end
-
-task default: [:rubocop, :spec, 'bundle:audit', :solargraph]
-
-desc 'Run all tasks desired for CI'
-task ci: ['solargraph:init', :default, :hadolint, :build]

docker/Dockerfile

@@ -1,23 +0,0 @@
-FROM alpine:3.13.5
-
-EXPOSE 5353 8080
-
-ARG DYNDNSD_VERSION
-
-RUN apk --no-cache add openssl ca-certificates && \
-    apk upgrade apk-tools libcrypto1.1 libssl1.1 && \
-    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 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

@@ -1,23 +0,0 @@
-FROM alpine:3.13.5
-
-EXPOSE 5353 8080
-
-COPY pkg/dyndnsd-*.gem /tmp/dyndnsd.gem
-
-RUN apk --no-cache add openssl ca-certificates && \
-    apk upgrade apk-tools libcrypto1.1 libssl1.1 && \
-    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

@@ -25,23 +25,20 @@ 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 = '>= 2.3'
 
   s.add_runtime_dependency 'async-dns', '~> 1.2.0'
+  s.add_runtime_dependency 'jaeger-client', '~> 0.10.0'
   s.add_runtime_dependency 'metriks'
-  s.add_runtime_dependency 'opentelemetry-exporter-jaeger', '~> 0.20.0'
+  s.add_runtime_dependency 'opentracing', '~> 0.5.0'
-  s.add_runtime_dependency 'opentelemetry-instrumentation-rack', '~> 0.19.0'
-  s.add_runtime_dependency 'opentelemetry-sdk', '~> 1.0.0.rc2'
   s.add_runtime_dependency 'rack', '~> 2.0'
-  s.add_runtime_dependency 'webrick', '>= 1.6.1'
+  s.add_runtime_dependency 'rack-tracer', '~> 0.9.0'
 
   s.add_development_dependency 'bundler'
-  s.add_development_dependency 'bundler-audit', '~> 0.8.0'
+  s.add_development_dependency 'bundler-audit', '~> 0.7.0'
   s.add_development_dependency 'rack-test'
   s.add_development_dependency 'rake'
   s.add_development_dependency 'rspec'
-  s.add_development_dependency 'rubocop', '~> 1.19.0'
+  s.add_development_dependency 'rubocop', '~> 0.81.0'
-  s.add_development_dependency 'rubocop-rake', '~> 0.6.0'
+  s.add_development_dependency 'solargraph'
-  s.add_development_dependency 'rubocop-rspec', '~> 2.4.0'
-  s.add_development_dependency 'solargraph', '~> 0.43.0'
 end

lib/dyndnsd.rb

@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require 'date'
 require 'etc'
 require 'logger'
 require 'ipaddr'
@@ -8,9 +7,9 @@ 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 +68,7 @@ module Dyndnsd
     # @return [Boolean]
     def authorized?(username, password)
       Helper.span('check_authorized') do |span|
-        span.set_attribute('enduser.id', username)
+        span.set_tag('dyndnsd.user', username)
 
         allow = Helper.user_allowed?(username, password, @users)
         if !allow
@@ -81,7 +80,7 @@ module Dyndnsd
     end
 
     # @param env [Hash{String => String}]
-    # @return [Array{Integer,Hash{String => String},Array<String>}]
+    # @return [Array{Integer,Hash{String => String},Array{String}}]
     def call(env)
       return [422, {'X-DynDNS-Response' => 'method_forbidden'}, []] if env['REQUEST_METHOD'] != 'GET'
       return [422, {'X-DynDNS-Response' => 'not_found'}, []] if env['PATH_INFO'] != '/nic/update'
@@ -112,7 +111,7 @@ module Dyndnsd
 
       Dyndnsd.logger.info 'Starting...'
 
-      # drop privileges as soon as possible
+      # drop priviliges as soon as possible
       # NOTE: first change group than user
       if config['group']
         group = Etc.getgrnam(config['group'])
@@ -135,7 +134,7 @@ module Dyndnsd
     private
 
     # @param params [Hash{String => String}]
-    # @return [Array<String>]
+    # @return [Array{String}]
     def extract_v4_and_v6_address(params)
       return [] if !(params['myip'])
       begin
@@ -149,7 +148,7 @@ module Dyndnsd
 
     # @param env [Hash{String => String}]
     # @param params [Hash{String => String}]
-    # @return [Array<String>]
+    # @return [Array{String}]
     def extract_myips(env, params)
       # require presence of myip parameter as valid IPAddr (v4) and valid myip6
       return extract_v4_and_v6_address(params) if params.key?('myip6')
@@ -165,12 +164,12 @@ module Dyndnsd
     end
 
     # @param hostnames [String]
-    # @param myips [Array<String>]
+    # @param myips [Array{String}]
-    # @return [Array<Symbol>]
+    # @return [Array{Symbol}]
     def process_changes(hostnames, myips)
       changes = []
       Helper.span('process_changes') do |span|
-        span.set_attribute('dyndnsd.hostnames', hostnames.join(','))
+        span.set_tag('dyndnsd.hostnames', hostnames.join(','))
 
         hostnames.each do |hostname|
           # myips order is always deterministic
@@ -201,7 +200,7 @@ module Dyndnsd
     end
 
     # @param env [Hash{String => String}]
-    # @return [Array{Integer,Hash{String => String},Array<String>}]
+    # @return [Array{Integer,Hash{String => String},Array{String}}]
     def handle_dyndns_request(env)
       params = Rack::Utils.parse_query(env['QUERY_STRING'])
 
@@ -246,14 +245,12 @@ module Dyndnsd
       if config['logfile']
         Dyndnsd.logger = Logger.new(config['logfile'])
       else
-        Dyndnsd.logger = Logger.new($stdout)
+        Dyndnsd.logger = Logger.new(STDOUT)
       end
 
       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]
@@ -298,31 +295,16 @@ module Dyndnsd
     # @param config [Hash{String => Object}]
     # @return [void]
     private_class_method def self.setup_tracing(config)
-      # by default do not try to emit any traces until the user opts in
+      # configure OpenTracing
-      ENV['OTEL_TRACES_EXPORTER'] ||= 'none'
+      if config.dig('tracing', 'jaeger')
+        require 'jaeger/client'
 
-      # configure OpenTelemetry
+        host = config['tracing']['jaeger']['host'] || '127.0.0.1'
-      OpenTelemetry::SDK.configure do |c|
+        port = config['tracing']['jaeger']['port'] || 6831
-        if config.dig('tracing', 'jaeger')
+        service_name = config['tracing']['jaeger']['service_name'] || 'dyndnsd'
-          require 'opentelemetry/exporter/jaeger'
+        OpenTracing.global_tracer = Jaeger::Client.build(
-
+          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
 
@@ -348,7 +330,8 @@ module Dyndnsd
         app = Responder::DynDNSStyle.new(app)
       end
 
-      app = OpenTelemetry::Instrumentation::Rack::Middlewares::TracerMiddleware.new(app)
+      trust_incoming_span = config.dig('tracing', 'trust_incoming_span') || false
+      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/generator/bind.rb

@@ -27,7 +27,7 @@ module Dyndnsd
           ips.each do |ip|
             ip = IPAddr.new(ip).native
             type = ip.ipv6? ? 'AAAA' : 'A'
-            name = hostname.chomp(".#{@domain}")
+            name = hostname.chomp('.' + @domain)
             out << "#{name} IN #{type} #{ip}"
           end
         end

lib/dyndnsd/helper.rb

@@ -45,17 +45,24 @@ module Dyndnsd
     # @param block [Proc]
     # @return [void]
     def self.span(operation, &block)
-      tracer = OpenTelemetry.tracer_provider.tracer(Dyndnsd.name, Dyndnsd::VERSION)
+      scope = OpenTracing.start_active_span(operation)
-      tracer.in_span(
+      span = scope.span
-        operation,
+      span.set_tag('component', 'dyndnsd')
-        attributes: {'component' => 'dyndnsd'},
+      span.set_tag('span.kind', 'server')
-        kind: :server
+      begin
-      ) 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.record_exception(e)
+        span.set_tag('error', true)
-        raise e
+        span.log_kv(
+          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/responder/dyndns_style.rb

@@ -9,7 +9,7 @@ module Dyndnsd
       end
 
       # @param env [Hash{String => String}]
-      # @return [Array{Integer,Hash{String => String},Array<String>}]
+      # @return [Array{Integer,Hash{String => String},Array{String}}]
       def call(env)
         @app.call(env).tap do |status_code, headers, body|
           if headers.key?('X-DynDNS-Response')
@@ -24,32 +24,30 @@ module Dyndnsd
 
       # @param status_code [Integer]
       # @param headers [Hash{String => String}]
-      # @param body [Array<String>]
+      # @param body [Array{String}]
-      # @return [Array{Integer,Hash{String => String},Array<String>}]
+      # @return [Array{Integer,Hash{String => String},Array{String}}]
       def decorate_dyndnsd_response(status_code, headers, body)
-        case status_code
+        if status_code == 200
-        when 200
           [200, {'Content-Type' => 'text/plain'}, [get_success_body(body[0], body[1])]]
-        when 422
+        elsif status_code == 422
           error_response_map[headers['X-DynDNS-Response']]
         end
       end
 
       # @param status_code [Integer]
       # @param headers [Hash{String => String}]
-      # @param _body [Array<String>]
+      # @param _body [Array{String}]
-      # @return [Array{Integer,Hash{String => String},Array<String>}]
+      # @return [Array{Integer,Hash{String => String},Array{String}}]
       def decorate_other_response(status_code, headers, _body)
-        case status_code
+        if status_code == 400
-        when 400
           [status_code, headers, ['Bad Request']]
-        when 401
+        elsif status_code == 401
           [status_code, headers, ['badauth']]
         end
       end
 
-      # @param changes [Array<Symbol>]
+      # @param changes [Array{Symbol}]
-      # @param myips [Array<String>]
+      # @param myips [Array{String}]
       # @return [String]
       def get_success_body(changes, myips)
         changes.map { |change| "#{change} #{myips.join(' ')}" }.join("\n")

lib/dyndnsd/responder/rest_style.rb

@@ -9,7 +9,7 @@ module Dyndnsd
       end
 
       # @param env [Hash{String => String}]
-      # @return [Array{Integer,Hash{String => String},Array<String>}]
+      # @return [Array{Integer,Hash{String => String},Array{String}}]
       def call(env)
         @app.call(env).tap do |status_code, headers, body|
           if headers.key?('X-DynDNS-Response')
@@ -24,32 +24,30 @@ module Dyndnsd
 
       # @param status_code [Integer]
       # @param headers [Hash{String => String}]
-      # @param body [Array<String>]
+      # @param body [Array{String}]
-      # @return [Array{Integer,Hash{String => String},Array<String>}]
+      # @return [Array{Integer,Hash{String => String},Array{String}}]
       def decorate_dyndnsd_response(status_code, headers, body)
-        case status_code
+        if status_code == 200
-        when 200
           [200, {'Content-Type' => 'text/plain'}, [get_success_body(body[0], body[1])]]
-        when 422
+        elsif status_code == 422
           error_response_map[headers['X-DynDNS-Response']]
         end
       end
 
       # @param status_code [Integer]
       # @param headers [Hash{String => String}]
-      # @param _body [Array<String>]
+      # @param _body [Array{String}]
-      # @return [Array{Integer,Hash{String => String},Array<String>}]
+      # @return [Array{Integer,Hash{String => String},Array{String}}]
       def decorate_other_response(status_code, headers, _body)
-        case status_code
+        if status_code == 400
-        when 400
           [status_code, headers, ['Bad Request']]
-        when 401
+        elsif status_code == 401
           [status_code, headers, ['Unauthorized']]
         end
       end
 
-      # @param changes [Array<Symbol>]
+      # @param changes [Array{Symbol}]
-      # @param myips [Array<String>]
+      # @param myips [Array{String}]
       # @return [String]
       def get_success_body(changes, myips)
         changes.map { |change| change == :good ? "Changed to #{myips.join(' ')}" : "No change needed for #{myips.join(' ')}" }.join("\n")

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| } # default: ignore errors
+      @on_error  = options[:on_error] || proc { |ex| }
     end
 
     # @return [void]
@@ -28,9 +28,11 @@ module Dyndnsd
           sleep @interval
 
           Thread.new do
-            write
+            begin
-          rescue StandardError => e
+              write
-            @on_error[e] rescue nil
+            rescue StandardError => e
+              @on_error[e] rescue nil
+            end
           end
         end
       end
@@ -94,8 +96,8 @@ module Dyndnsd
     # @param file [String]
     # @param base_name [String]
     # @param metric [Object]
-    # @param keys [Array<Symbol>]
+    # @param keys [Array{Symbol}]
-    # @param snapshot_keys [Array<Symbol>]
+    # @param snapshot_keys [Array{Symbol}]
     # @return [void]
     def write_metric(file, base_name, metric, keys, snapshot_keys = [])
       time = Time.now.to_i

lib/dyndnsd/updater/command_with_bind_zone.rb

@@ -18,7 +18,7 @@ module Dyndnsd
         return if !db.changed?
 
         Helper.span('updater_update') do |span|
-          span.set_attribute('dyndnsd.updater.name', self.class.name&.split('::')&.last || 'None')
+          span.set_tag('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)) }

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_attribute('dyndnsd.updater.name', self.class.name&.split('::')&.last || 'None')
+          span.set_tag('dyndnsd.updater.name', self.class.name&.split('::')&.last || 'None')
 
           soa_rr = Resolv::DNS::Resource::IN::SOA.new(
             @zone_nameservers[0], @zone_email_address,
@@ -85,7 +85,7 @@ module Dyndnsd
 
       # converts into suitable parameter form for Async::DNS::Resolver or Async::DNS::Server
       #
-      # @param endpoint_list [Array<String>]
+      # @param endpoint_list [Array{String}]
       # @return [Array{Array{Object}}]
       def self.parse_endpoints(endpoint_list)
         endpoint_list.map { |addr_string| addr_string.split('@') }
@@ -139,7 +139,7 @@ module Dyndnsd
 
       # @param name [String]
       # @param resource_class [Resolv::DNS::Resource]
-      # Since solargraph cannot parse this: param transaction [Async::DNS::Transaction]
+      # @param transaction [Async::DNS::Transaction]
       # @return [void]
       def process(name, resource_class, transaction)
         if name != @domain || resource_class != Resolv::DNS::Resource::Generic::Type252_Class1

lib/dyndnsd/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Dyndnsd
-  VERSION = '3.4.5'
+  VERSION = '2.3.1'
 end

spec/daemon_spec.rb

@@ -1,12 +1,12 @@
 # frozen_string_literal: true
 
-require_relative '../spec_helper'
+require_relative 'spec_helper'
 
 describe Dyndnsd::Daemon do
   include Rack::Test::Methods
 
   def app
-    Dyndnsd.logger = Logger.new($stdout)
+    Dyndnsd.logger = Logger.new(STDOUT)
     Dyndnsd.logger.level = Logger::UNKNOWN
 
     config = {
@@ -24,7 +24,9 @@ describe Dyndnsd::Daemon do
 
     app = Rack::Auth::Basic.new(daemon, 'DynDNS', &daemon.method(:authorized?))
 
-    Dyndnsd::Responder::DynDNSStyle.new(app)
+    app = Dyndnsd::Responder::DynDNSStyle.new(app)
+
+    Rack::Tracer.new(app, trust_incoming_span: false)
   end
 
   it 'requires authentication' do

upgrade-version.sh

@@ -1,13 +0,0 @@
-#!/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